chore(deps): bump alpine from 3.20 to 3.21

Bumps alpine from 3.20 to 3.21.

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

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

Dockerfile.alpine

@@ -1,5 +1,5 @@
 # Use multi-stage build
-FROM alpine:3.20
+FROM alpine:3.21
 
 # Create liquibase user
 RUN addgroup --gid 1001 liquibase && \