Bump alpine from 3.21.2 to 3.21.3

Bumps alpine from 3.21.2 to 3.21.3.

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

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

Author: dependabot[bot]

Dockerfile

@@ -12,7 +12,7 @@ COPY . /go/migrator
 RUN cd /go/migrator && \
   go build -ldflags "-X main.GitSha=$GIT_SHA -X main.GitRef=$GIT_REF"
 
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 LABEL org.opencontainers.image.authors="Łukasz Budnik <[email protected]>"