Upgrade whitenoise from 6.3.0 to 6.8.2.

We suspect whitenoise PR #612 may resolve an issue with the database connection
intermittently and randomly closing during requests observed in production.

For some reason, Dependabot did not automatically make this upgrade, but it
appears to work without issue in local testing.

requirements.prod.in

@@ -36,5 +36,7 @@ structlog
 # 2.1.0 appears to be causing some problems with exporting
 # https://github.com/opensafely-core/job-server/issues/3955
 urllib3<=2.2.3
-whitenoise[brotli]
+# Serves static files. Dependabot wasn't updating past 6.3.0 for
+# unclear reasons, and we want fix #612 from 6.8.0.
+whitenoise[brotli]>=6.8.0
 xkcdpass

requirements.prod.txt

@@ -920,9 +920,9 @@ urllib3==2.2.3 \
     #   -r requirements.prod.in
     #   requests
     #   sentry-sdk
-whitenoise==6.3.0 \
-    --hash=sha256:cf8ecf56d86ba1c734fdb5ef6127312e39e92ad5947fef9033dc9e43ba2777d9 \
-    --hash=sha256:fe0af31504ab08faa1ec7fc02845432096e40cc1b27e6a7747263d7b30fb51fa
+whitenoise==6.8.2 \
+    --hash=sha256:486bd7267a375fa9650b136daaec156ac572971acc8bf99add90817a530dd1d4 \
+    --hash=sha256:df12dce147a043d1956d81d288c6f0044147c6d2ab9726e5772ac50fb45d2280
     # via -r requirements.prod.in
 wrapt==1.16.0 \
     --hash=sha256:0d2691979e93d06a95a26257adb7bfd0c93818e89b1406f5a28f36e0d8c1e1fc \