chore(deps): update docker/login-action action to v4

Author: renovate[bot]

.github/workflows/docker.yml

@@ -63,13 +63,13 @@ jobs:
             ${{ runner.os }}-buildx-
       - name: Login to DockerHub
         if: github.repository == 'fclairamb/ftpserver'
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Login to GitHub Container Registry
         if: github.repository == 'fclairamb/ftpserver'
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}