Bump alpine from 3.20.3 to 3.21.0 in the container-images group (#301)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -9,7 +9,7 @@ ARG TARGETOS TARGETARCH
 RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -o ./bin/version-checker ./cmd/.
 
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 LABEL description="Kubernetes utility for exposing used image versions compared to the latest version, as metrics."
 
 RUN apk --no-cache add ca-certificates