build(deps): Bump alpine from 3.20.2 to 3.20.3

Bumps alpine from 3.20.2 to 3.20.3.

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

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -5,7 +5,7 @@
 
 # TODO: Using alpine for now due to easier installation of skopeo
 #       Will use distroless after incorporating skopeo into the webhook directly
-FROM alpine:3.20.2
+FROM alpine:3.20.3
 RUN ["apk", "add", "--no-cache", "--repository=http://dl-cdn.alpinelinux.org/alpine/edge/community", "skopeo>=1.2.0"]
 
 COPY k8s-image-swapper /