Bump golang in /examples/deployment/docker/db_client

Bumps golang from 1.21.6-bookworm to 1.22.0-bookworm.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

examples/deployment/docker/db_client/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21.6-bookworm@sha256:3efef61ff1d99c8a90845100e2a7e934b4a5d11b639075dc605ff53c141044fc
+FROM golang:1.22.0-bookworm@sha256:874c2677e43be36a429823f2742af85844772664f273c1c8c8235f10aba51cd3
 
 RUN apt-get update && \
     apt-get install -y mariadb-client