alpine(deps): bump alpine from 3.20.3 to 3.21.0 in /images/alpine (ky…

…ma-project#12433)

Bumps alpine from 3.20.3 to 3.21.0.

---
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>

images/alpine/Dockerfile

@@ -1,3 +1,3 @@
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 
 RUN apk upgrade --no-cache && apk add --no-cache ca-certificates bash && update-ca-certificates