build(deps): bump alpine from 3.17.2 to 3.18.3 in /docker

Bumps alpine from 3.17.2 to 3.18.3.

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

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

docker/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # syntax=docker/dockerfile:1
-FROM alpine:3.17.2
+FROM alpine:3.18.3
 
 RUN apk add --no-cache \
   bash \