chore(deps): update dependency webpack to v5 (#35)

Author: renovate-bot

packages/google-cloud-bigquery-connection/package.json

@@ -59,7 +59,7 @@
     "sinon": "^9.0.2",
     "ts-loader": "^8.0.0",
     "typescript": "^3.9.5",
-    "webpack": "^4.43.0",
+    "webpack": "^5.0.0",
     "webpack-cli": "^3.3.11",
     "@microsoft/api-documenter": "^7.8.10",
     "@microsoft/api-extractor": "^7.8.10"