CI: bump docker/login-action from 3 to 4 (#10)

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.github/workflows/publish-oci.yml

@@ -168,7 +168,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Log in to GHCR
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}