chore(deps): 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] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -18,7 +18,7 @@ COPY . /src/
 RUN BUILD_TAGS=muslc LINK_STATICALLY=true make build
 
 #--- Image stage
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 
 COPY --from=go-builder /src/target/dist/axoned /usr/bin/axoned