chore(deps): bump docker/login-action from 2 to 3

Bumps [docker/login-action](https://github.com/docker/login-action) from 2 to 3.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](docker/login-action@v2...v3)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/backend.yml

@@ -59,14 +59,14 @@ jobs:
           cache: 'gradle'
 
       # - name: Login to GitHub Packages Docker Registry
-      #   uses: docker/login-action@v2
+      #   uses: docker/login-action@v3
       #   with:
       #     registry: docker.pkg.github.com
       #     username: ${{ github.repository_owner }}
       #     password: ${{ secrets.GH_PACKAGES_TOKEN }}
 
       - name: Login to DockerHub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}