explicitly install greenlet to fix sqlalchemy install in CI

sqlalchemy==2.0.23 has a conditional install of greenlet [1] which
affects a very complex set of architectures.  This has only affected us
in CI so far, but breaks pip installs there because we don't have
greenlet installed and we're using pip in hashes mode.

The install_requires has been updated for the upcoming 2.1 release to
avoid this situation, so we can remove this change once that's released.

1: https://github.com/sqlalchemy/sqlalchemy/blob/rel_2_0_23/setup.cfg#L40

pyproject.toml

@@ -15,6 +15,7 @@ requires-python = ">=3.11"
 dependencies = [
   "click",
   "github-to-sqlite",
+  "greenlet",
   "requests",
   "slack-bolt",
   "sqlalchemy[postgresql_psycopgbinary]",

requirements.prod.txt

@@ -115,6 +115,65 @@ github-to-sqlite==2.8.3 \
     --hash=sha256:16af0e18e4c1002e973b585333207b061137f509a9c42fc2ad48eae797ac3f0b \
     --hash=sha256:f5f28b9144bb758f99a923dadd7c3904c84c5786f34cc70c47ba64ee6f7dbe41
     # via metrics (pyproject.toml)
+greenlet==3.0.1 \
+    --hash=sha256:0a02d259510b3630f330c86557331a3b0e0c79dac3d166e449a39363beaae174 \
+    --hash=sha256:0b6f9f8ca7093fd4433472fd99b5650f8a26dcd8ba410e14094c1e44cd3ceddd \
+    --hash=sha256:100f78a29707ca1525ea47388cec8a049405147719f47ebf3895e7509c6446aa \
+    --hash=sha256:1757936efea16e3f03db20efd0cd50a1c86b06734f9f7338a90c4ba85ec2ad5a \
+    --hash=sha256:19075157a10055759066854a973b3d1325d964d498a805bb68a1f9af4aaef8ec \
+    --hash=sha256:19bbdf1cce0346ef7341705d71e2ecf6f41a35c311137f29b8a2dc2341374565 \
+    --hash=sha256:20107edf7c2c3644c67c12205dc60b1bb11d26b2610b276f97d666110d1b511d \
+    --hash=sha256:22f79120a24aeeae2b4471c711dcf4f8c736a2bb2fabad2a67ac9a55ea72523c \
+    --hash=sha256:2847e5d7beedb8d614186962c3d774d40d3374d580d2cbdab7f184580a39d234 \
+    --hash=sha256:28e89e232c7593d33cac35425b58950789962011cc274aa43ef8865f2e11f46d \
+    --hash=sha256:329c5a2e5a0ee942f2992c5e3ff40be03e75f745f48847f118a3cfece7a28546 \
+    --hash=sha256:337322096d92808f76ad26061a8f5fccb22b0809bea39212cd6c406f6a7060d2 \
+    --hash=sha256:3fcc780ae8edbb1d050d920ab44790201f027d59fdbd21362340a85c79066a74 \
+    --hash=sha256:41bdeeb552d814bcd7fb52172b304898a35818107cc8778b5101423c9017b3de \
+    --hash=sha256:4eddd98afc726f8aee1948858aed9e6feeb1758889dfd869072d4465973f6bfd \
+    --hash=sha256:52e93b28db27ae7d208748f45d2db8a7b6a380e0d703f099c949d0f0d80b70e9 \
+    --hash=sha256:55d62807f1c5a1682075c62436702aaba941daa316e9161e4b6ccebbbf38bda3 \
+    --hash=sha256:5805e71e5b570d490938d55552f5a9e10f477c19400c38bf1d5190d760691846 \
+    --hash=sha256:599daf06ea59bfedbec564b1692b0166a0045f32b6f0933b0dd4df59a854caf2 \
+    --hash=sha256:60d5772e8195f4e9ebf74046a9121bbb90090f6550f81d8956a05387ba139353 \
+    --hash=sha256:696d8e7d82398e810f2b3622b24e87906763b6ebfd90e361e88eb85b0e554dc8 \
+    --hash=sha256:6e6061bf1e9565c29002e3c601cf68569c450be7fc3f7336671af7ddb4657166 \
+    --hash=sha256:80ac992f25d10aaebe1ee15df45ca0d7571d0f70b645c08ec68733fb7a020206 \
+    --hash=sha256:816bd9488a94cba78d93e1abb58000e8266fa9cc2aa9ccdd6eb0696acb24005b \
+    --hash=sha256:85d2b77e7c9382f004b41d9c72c85537fac834fb141b0296942d52bf03fe4a3d \
+    --hash=sha256:87c8ceb0cf8a5a51b8008b643844b7f4a8264a2c13fcbcd8a8316161725383fe \
+    --hash=sha256:89ee2e967bd7ff85d84a2de09df10e021c9b38c7d91dead95b406ed6350c6997 \
+    --hash=sha256:8bef097455dea90ffe855286926ae02d8faa335ed8e4067326257cb571fc1445 \
+    --hash=sha256:8d11ebbd679e927593978aa44c10fc2092bc454b7d13fdc958d3e9d508aba7d0 \
+    --hash=sha256:91e6c7db42638dc45cf2e13c73be16bf83179f7859b07cfc139518941320be96 \
+    --hash=sha256:97e7ac860d64e2dcba5c5944cfc8fa9ea185cd84061c623536154d5a89237884 \
+    --hash=sha256:990066bff27c4fcf3b69382b86f4c99b3652bab2a7e685d968cd4d0cfc6f67c6 \
+    --hash=sha256:9fbc5b8f3dfe24784cee8ce0be3da2d8a79e46a276593db6868382d9c50d97b1 \
+    --hash=sha256:ac4a39d1abae48184d420aa8e5e63efd1b75c8444dd95daa3e03f6c6310e9619 \
+    --hash=sha256:b2c02d2ad98116e914d4f3155ffc905fd0c025d901ead3f6ed07385e19122c94 \
+    --hash=sha256:b2d3337dcfaa99698aa2377c81c9ca72fcd89c07e7eb62ece3f23a3fe89b2ce4 \
+    --hash=sha256:b489c36d1327868d207002391f662a1d163bdc8daf10ab2e5f6e41b9b96de3b1 \
+    --hash=sha256:b641161c302efbb860ae6b081f406839a8b7d5573f20a455539823802c655f63 \
+    --hash=sha256:b8ba29306c5de7717b5761b9ea74f9c72b9e2b834e24aa984da99cbfc70157fd \
+    --hash=sha256:b9934adbd0f6e476f0ecff3c94626529f344f57b38c9a541f87098710b18af0a \
+    --hash=sha256:ce85c43ae54845272f6f9cd8320d034d7a946e9773c693b27d620edec825e376 \
+    --hash=sha256:cf868e08690cb89360eebc73ba4be7fb461cfbc6168dd88e2fbbe6f31812cd57 \
+    --hash=sha256:d2905ce1df400360463c772b55d8e2518d0e488a87cdea13dd2c71dcb2a1fa16 \
+    --hash=sha256:d57e20ba591727da0c230ab2c3f200ac9d6d333860d85348816e1dca4cc4792e \
+    --hash=sha256:d6a8c9d4f8692917a3dc7eb25a6fb337bff86909febe2f793ec1928cd97bedfc \
+    --hash=sha256:d923ff276f1c1f9680d32832f8d6c040fe9306cbfb5d161b0911e9634be9ef0a \
+    --hash=sha256:daa7197b43c707462f06d2c693ffdbb5991cbb8b80b5b984007de431493a319c \
+    --hash=sha256:dbd4c177afb8a8d9ba348d925b0b67246147af806f0b104af4d24f144d461cd5 \
+    --hash=sha256:dc4d815b794fd8868c4d67602692c21bf5293a75e4b607bb92a11e821e2b859a \
+    --hash=sha256:e9d21aaa84557d64209af04ff48e0ad5e28c5cca67ce43444e939579d085da72 \
+    --hash=sha256:ea6b8aa9e08eea388c5f7a276fabb1d4b6b9d6e4ceb12cc477c3d352001768a9 \
+    --hash=sha256:eabe7090db68c981fca689299c2d116400b553f4b713266b130cfc9e2aa9c5a9 \
+    --hash=sha256:f2f6d303f3dee132b322a14cd8765287b8f86cdc10d2cb6a6fae234ea488888e \
+    --hash=sha256:f33f3258aae89da191c6ebaa3bc517c6c4cbc9b9f689e5d8452f7aedbb913fa8 \
+    --hash=sha256:f7bfb769f7efa0eefcd039dd19d843a4fbfbac52f1878b1da2ed5793ec9b1a65 \
+    --hash=sha256:f89e21afe925fcfa655965ca8ea10f24773a1791400989ff32f467badfe4a064 \
+    --hash=sha256:fa24255ae3c0ab67e613556375a4341af04a084bd58764731972bcbc8baeba36
+    # via metrics (pyproject.toml)
 idna==3.4 \
     --hash=sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4 \
     --hash=sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2