deps: update alpine docker tag to v3.20 (#646)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.19
+FROM alpine:3.20
 RUN apk add --no-cache ca-certificates bash
 COPY hcloud-cloud-controller-manager /bin/hcloud-cloud-controller-manager
 ENTRYPOINT ["/bin/hcloud-cloud-controller-manager"]

hack/Dockerfile

@@ -8,7 +8,7 @@ RUN ls -al
 ARG SKAFFOLD_GO_GCFLAGS
 RUN CGO_ENABLED=0 go build -gcflags="${SKAFFOLD_GO_GCFLAGS}" -o hcloud-cloud-controller-manager.bin github.com/hetznercloud/hcloud-cloud-controller-manager
 
-FROM alpine:3.19
+FROM alpine:3.20
 RUN apk add --no-cache ca-certificates bash
 COPY --from=builder /hccm/hcloud-cloud-controller-manager.bin /bin/hcloud-cloud-controller-manager
 ENTRYPOINT ["/bin/hcloud-cloud-controller-manager"]