Update dependency @google-cloud/trace-agent to v2.11.0

Author: renovate[bot]

trace/package.json

@@ -21,7 +21,7 @@
     "e2e-test": "repo-tools test deploy"
   },
   "dependencies": {
-    "@google-cloud/trace-agent": "2.5.0",
+    "@google-cloud/trace-agent": "2.11.0",
     "express": "4.16.2",
     "got": "8.2.0"
   },