Bump the docker-deps group across 2 directories with 2 updates

Bumps the docker-deps group with 1 update in the /actions/setup-sigstore-env directory: sigstore/cosign/cosign.
Bumps the docker-deps group with 1 update in the /config/trillian/mysql directory: trillian-opensource-ci/db_server.


Updates `sigstore/cosign/cosign` from v3.0.2 to v3.0.3

Updates `trillian-opensource-ci/db_server` from `97e30a9` to `6e0ff22`

---
updated-dependencies:
- dependency-name: sigstore/cosign/cosign
  dependency-version: v3.0.3
  dependency-type: direct:production
  dependency-group: docker-deps
- dependency-name: trillian-opensource-ci/db_server
  dependency-version: 6e0ff22dd0c3c35b1898b458f784eaa4b9ae5974b303a92f7fca9806b66e4a11
  dependency-type: direct:production
  dependency-group: docker-deps
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

actions/setup-sigstore-env/Dockerfile.cosign

@@ -13,6 +13,6 @@
 # limitations under the License.
 
 # Use Cosign from a container so that Dependabot will keep the dependency up to date
-FROM ghcr.io/sigstore/cosign/cosign:v3.0.2@sha256:b29487e48205d875c324c79583e2806d9d269c0fa299e0861bbec023d8430c8b
+FROM ghcr.io/sigstore/cosign/cosign:v3.0.3@sha256:774391ac9f0c137ee419ce56522df5fd3b1f52be90c5b77e97f7c053bdd67a67
 
 ENTRYPOINT [ "cosign" ]

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@sha256:97e30a9a4cc4d303b296d80e8f3ad852b8380dbe7b8f10d6bcab91b991a0d372
+    - image: gcr.io/trillian-opensource-ci/db_server@sha256:6e0ff22dd0c3c35b1898b458f784eaa4b9ae5974b303a92f7fca9806b66e4a11
       name: mysql
       env:
         - name: MYSQL_ROOT_PASSWORD