Update docker/login-action action to v3

.forgejo/workflows/docker.yml

@@ -13,12 +13,12 @@ jobs:
       image: ghcr.io/catthehacker/ubuntu:act-latest
     steps:
       - name: Login to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Login to cr.sp-codes.de
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: cr.sp-codes.de
           username: ${{ secrets.CR_USERNAME }}