chore(deps): update dependency protobuf to v5

.kokoro/docs/docker/requirements.txt

@@ -131,18 +131,18 @@ idna==3.6 \
     --hash=sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca \
     --hash=sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f
     # via requests
-protobuf==4.25.2 \
-    --hash=sha256:10894a2885b7175d3984f2be8d9850712c57d5e7587a2410720af8be56cdaf62 \
-    --hash=sha256:2db9f8fa64fbdcdc93767d3cf81e0f2aef176284071507e3ede160811502fd3d \
-    --hash=sha256:33a1aeef4b1927431d1be780e87b641e322b88d654203a9e9d93f218ee359e61 \
-    --hash=sha256:47f3de503fe7c1245f6f03bea7e8d3ec11c6c4a2ea9ef910e3221c8a15516d62 \
-    --hash=sha256:5e5c933b4c30a988b52e0b7c02641760a5ba046edc5e43d3b94a74c9fc57c1b3 \
-    --hash=sha256:8f62574857ee1de9f770baf04dde4165e30b15ad97ba03ceac65f760ff018ac9 \
-    --hash=sha256:a8b7a98d4ce823303145bf3c1a8bdb0f2f4642a414b196f04ad9853ed0c8f830 \
-    --hash=sha256:b50c949608682b12efb0b2717f53256f03636af5f60ac0c1d900df6213910fd6 \
-    --hash=sha256:d66a769b8d687df9024f2985d5137a337f957a0916cf5464d1513eee96a63ff0 \
-    --hash=sha256:fc381d1dd0516343f1440019cedf08a7405f791cd49eef4ae1ea06520bc1c020 \
-    --hash=sha256:fe599e175cb347efc8ee524bcd4b902d11f7262c0e569ececcb89995c15f0a5e
+protobuf==5.26.0 \
+    --hash=sha256:2c334550e1cb4efac5c8a3987384bf13a4334abaf5ab59e40479e7b70ecd6b19 \
+    --hash=sha256:6ee9d1aa02f951c5ce10bf8c6cfb7604133773038e33f913183c8b5201350600 \
+    --hash=sha256:7e47c57303466c867374a17b2b5e99c5a7c8b72a94118e2f28efb599f19b4069 \
+    --hash=sha256:82f5870d74c99addfe4152777bdf8168244b9cf0ac65f8eccf045ddfa9d80d9b \
+    --hash=sha256:8eef61a90631c21b06b4f492a27e199a269827f046de3bb68b61aa84fcf50905 \
+    --hash=sha256:a49b6c5359bf34fb7bf965bf21abfab4476e4527d822ab5289ee3bf73f291159 \
+    --hash=sha256:ca825f4eecb8c342d2ec581e6a5ad1ad1a47bededaecd768e0d3451ae4aaac2b \
+    --hash=sha256:dfd29f6eb34107dccf289a93d44fb6b131e68888d090b784b691775ac84e8213 \
+    --hash=sha256:e184175276edc222e2d5e314a72521e10049938a9a4961fe4bea9b25d073c03f \
+    --hash=sha256:efd4f5894c50bd76cbcfdd668cd941021333861ed0f441c78a83d8254a01cc9f \
+    --hash=sha256:f9ecc8eb6f18037e0cbf43256db0325d4723f429bca7ef5cd358b7c29d65f628
     # via
     #   gcp-docuploader
     #   google-api-core