Update GHA docker/login-action (#526)

... to use Node.js 20, after GHA Node.js 16 deprecation.

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
             docker tag fusedav $tag
           done
       - name: Log in to GitHub Container Registry
-        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}