Update docker/login-action digest to 6d4b68b

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -57,7 +57,7 @@ jobs:
       # https://github.com/docker/login-action
       - name: Log into GitHub Container Registry (GHCR)
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@3b8fed7e4b60203b2aa0ecc6c6d6d91d12c06760
+        uses: docker/login-action@6d4b68b490aef8836e8fb5e50ee7b3bdfa5894f0
         with:
           registry: ${{ env.REGISTRY_GHCR }}
           username: ${{ github.actor }}
@@ -66,7 +66,7 @@ jobs:
       # Login to Docker Hub
       - name: Log into Docker Hub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@3b8fed7e4b60203b2aa0ecc6c6d6d91d12c06760
+        uses: docker/login-action@6d4b68b490aef8836e8fb5e50ee7b3bdfa5894f0
         with:
           registry: ${{ env.REGISTRY_DOCKERHUB }}
           username: ${{ secrets.DOCKER_HUB_USER }}