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

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Author: dependabot[bot]

.github/workflows/build-and-push.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Login to Azure Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ${{ secrets.ACR_URL }}
           username: ${{ secrets.ACR_PUSH_USER }}