Update docker/login-action action to v3 (#33)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Andreas Heinrich <andreas.heinrich@rwth-aachen.de>

Author: renovate[bot]

.github/workflows/deploy-single-docker-image.yml

@@ -211,7 +211,7 @@ jobs:
       uses: docker/setup-buildx-action@v3
       if: ${{ needs.check.outputs.rebuild == 'true' || inputs.force_rebuild }}
     - name: Login to DockerHub
-      uses: docker/login-action@v2
+      uses: docker/login-action@v3
       if: ${{ needs.check.outputs.rebuild == 'true' || inputs.force_rebuild }}
       with:
         registry: ${{ inputs.docker_registry }}