Bump @google-cloud/trace-agent from 4.2.0 to 4.2.2 (#11432)

Bumps [@google-cloud/trace-agent](https://github.com/googleapis/cloud-trace-nodejs) from 4.2.0 to 4.2.2.
- [Release notes](https://github.com/googleapis/cloud-trace-nodejs/releases)
- [Changelog](https://github.com/googleapis/cloud-trace-nodejs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/cloud-trace-nodejs/compare/v4.2.0...v4.2.2)

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package.json

@@ -4,7 +4,7 @@
   "version": "4.116.8",
   "main": "./website/server/index.js",
   "dependencies": {
-    "@google-cloud/trace-agent": "^4.0.0",
+    "@google-cloud/trace-agent": "^4.2.2",
     "@slack/client": "^3.8.1",
     "accepts": "^1.3.5",
     "amazon-payments": "^0.2.7",