Update docker/login-action action to v4 (#170)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docker.yml

@@ -30,7 +30,7 @@ jobs:
         uses: actions/checkout@v6
       - uses: gradle/wrapper-validation-action@v3
       - name: Login to GitHub Packages
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}