Bump library/alpine from 7144f7b to 51b6726

Bumps library/alpine from `7144f7b` to `51b6726`.

---
updated-dependencies:
- dependency-name: library/alpine
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Dockerfile

@@ -4,7 +4,7 @@
 ARG PREBUILT
 
 # Fetched 2022/04/04
-FROM --platform=$BUILDPLATFORM docker.io/library/alpine@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a AS alpine
+FROM --platform=$BUILDPLATFORM docker.io/library/alpine@sha256:51b67269f354137895d43f3b3d810bfacd3945438e94dc5ac55fdac340352f48 AS alpine
 FROM --platform=$BUILDPLATFORM docker.io/nilslice/protolock@sha256:baf9bca8b7a28b945c557f36d562a34cf7ca85a63f6ba8cdadbe333e12ccea51 AS protolock
 FROM --platform=$BUILDPLATFORM docker.io/library/golang@sha256:b490ae1f0ece153648dd3c5d25be59a63f966b5f9e1311245c947de4506981aa AS golang
 FROM --platform=$BUILDPLATFORM docker.io/goreleaser/goreleaser@sha256:e8a4e0a0c9ccd1fcf456e5258b743bb63a3c68f50e03ae4fdfad7681761713e6 AS goreleaser