Update docker/login-action action to v4

Author: renovate[bot]

.github/workflows/prometheus_node_exporter.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout the repository
         uses: actions/checkout@v6
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}