build(deps): bump actions/delete-package-versions from 4 to 5

Bumps [actions/delete-package-versions](https://github.com/actions/delete-package-versions) from 4 to 5.
- [Release notes](https://github.com/actions/delete-package-versions/releases)
- [Commits](actions/delete-package-versions@v4...v5)

---
updated-dependencies:
- dependency-name: actions/delete-package-versions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/merge.yml

@@ -100,7 +100,7 @@ jobs:
         name: [backend-go, backend-py, backend-java, migrations-go, migrations-py]
     steps:
       - name: Keep last 50
-        uses: actions/delete-package-versions@v4
+        uses: actions/delete-package-versions@v5
         with:
           package-name: "${{ github.event.repository.name }}/${{ matrix.name }}"
           package-type: "container"