CI: Bump docker/login-action from v1 to v2

Fixes deprecation warnings from GHA.

Author: guihkx

.github/workflows/ci.yml

@@ -205,7 +205,7 @@ jobs:
 
       - name: Login to GitHub Container Registry
         if: steps.prepare-meta.outputs.has-image
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.actor }}