ci(dependabot): bump the actions group across 1 directory with 2 updates

Bumps the actions group with 2 updates in the / directory: [docker/login-action](https://github.com/docker/login-action) and [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `docker/login-action` from 3.2.0 to 3.3.0
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](docker/login-action@v3.2.0...v3.3.0)

Updates `docker/build-push-action` from 5 to 6
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

.github/workflows/docker-singularity-publish.yml

@@ -48,7 +48,7 @@ jobs:
       # https://github.com/docker/login-action
       - name: Log into registry ${{ env.REGISTRY }}
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3.2.0
+        uses: docker/login-action@v3.3.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -81,7 +81,7 @@ jobs:
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         id: docker_build
         with:
           context: .