Update dependency css-loader to v6.9.0

Author: renovate[bot]

billing/google/package.json

@@ -79,7 +79,7 @@
     "bufferutil": "4.0.7",
     "canvas": "2.10.2",
     "codecov": "3.8.3",
-    "css-loader": "6.7.2",
+    "css-loader": "6.9.0",
     "enzyme": "3.11.0",
     "enzyme-adapter-react-16": "1.15.7",
     "es-check": "6.2.1",