Bump ubuntu in /examples/deployment/kubernetes/mysql/image (#3471)

Bumps ubuntu from `6d7b5d3` to `a6d2b38`.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

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

examples/deployment/kubernetes/mysql/image/Dockerfile

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM ubuntu:jammy@sha256:6d7b5d3317a71adb5e175640150e44b8b9a9401a7dd394f44840626aff9fa94d
+FROM ubuntu:jammy@sha256:a6d2b38300ce017add71440577d5b0a90460d0e57fd7aec21dd0d1b0761bbfb2
 
 # Patch the OS-level packages and remove unneeded dependencies.
 RUN apt-get update \