Bump shrink/actions-docker-registry-tag from 3 to 4 (#52)

Bumps [shrink/actions-docker-registry-tag](https://github.com/shrink/actions-docker-registry-tag) from 3 to 4.
- [Release notes](https://github.com/shrink/actions-docker-registry-tag/releases)
- [Commits](shrink/actions-docker-registry-tag@v3...v4)

---
updated-dependencies:
- dependency-name: shrink/actions-docker-registry-tag
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tobias Müller <to.mueller@gmail.com>

.github/workflows/pr-close.yml

@@ -35,7 +35,7 @@ jobs:
       matrix:
         package: [frontend,rctool]
     steps:
-      - uses: shrink/actions-docker-registry-tag@v3
+      - uses: shrink/actions-docker-registry-tag@v4
         with:
           registry: ghcr.io
           repository: ${{ github.repository }}/${{ matrix.package }}

.github/workflows/prod.yml

@@ -44,7 +44,7 @@ jobs:
       matrix:
         component: [frontend, rctool]
     steps:
-      - uses: shrink/actions-docker-registry-tag@v3
+      - uses: shrink/actions-docker-registry-tag@v4
         with:
           registry: ghcr.io
           repository: ${{ github.repository }}/${{ matrix.component }}