Bump mongo from 7.0.7 to 7.0.8 in /db

Bumps mongo from 7.0.7 to 7.0.8.

---
updated-dependencies:
- dependency-name: mongo
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

db/Dockerfile

@@ -1,5 +1,5 @@
 # Get mongo latest.
-FROM mongo:7.0.7
+FROM mongo:7.0.8
 
 # Create /docker-entrypoint-initdb.d directory.
 RUN mkdir -p /docker-entrypoint-initdb.d