Bump alpine from 3.20.3 to 3.21.0

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] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -9,7 +9,7 @@ RUN mkdir -p /assets \
  && go build -o /assets/out assets/out/main/out.go \
  && go build -o /assets/check assets/check/main/check.go
 
-FROM alpine:3.20.3 AS runtime
+FROM alpine:3.21.0 AS runtime
 RUN apk add --no-cache ca-certificates
 COPY --from=build assets/ /opt/resource/
 RUN chmod +x /opt/resource/*