Bump docker/login-action from 3 to 4 (#50)

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
-      - uses: docker/login-action@v3
+      - uses: docker/login-action@v4
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}