Bump trillian-opensource-ci/db_server in /config/trillian/mysql (#1262)

Bumps trillian-opensource-ci/db_server from `58f8b09` to `c5195ff`.

---
updated-dependencies:
- dependency-name: trillian-opensource-ci/db_server
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

config/trillian/mysql/300-mysql-trillian.yaml

@@ -20,7 +20,7 @@ metadata:
     app: mysql-trillian
 spec:
   containers:
-    - image: gcr.io/trillian-opensource-ci/db_server@sha256:58f8b0953fa2b67e8fec59d3cd2a18cd0892674ae9cc150aa86abf3fc2ef154d
+    - image: gcr.io/trillian-opensource-ci/db_server@sha256:c5195ff7b05084478f1125167f6ae314e46cade50d761665e2063e27c0a20314
       name: mysql
       env:
         - name: MYSQL_ROOT_PASSWORD