Bump alpine from 3.17.3 to 3.18.0 (#6)

Bumps alpine from 3.17.3 to 3.18.0.

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

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

Author: dependabot[bot]

Dockerfile

@@ -1,3 +1,3 @@
-FROM alpine:3.17.3
+FROM alpine:3.18.0
 COPY --from=arigaio/atlas:0.11.0-alpine /atlas /bin/atlas
 COPY --from=gcr.io/cloudsql-docker/gce-proxy:1.33.6 /cloud_sql_proxy /bin/cloud_sql_proxy