chore(deps): update dependency com.google.api-client:google-api-client-bom to v2.8.1 (#27152)

Author: renovate-bot

generator/src/googleapis/codegen/languages/java/2.0.0/features.json

@@ -3,7 +3,7 @@
   "description": "Java libraries for Google APIs.",
   "generator": "java1_15",
   "releaseVersion": "2.0.0",
-  "baseClientLibrary": "2.7.2",
+  "baseClientLibrary": "2.8.1",
   "oauthClientLibrary": "1.39.0",
   "gsonVersion": "2.11.0",
   "httpClientLibrary": "2.0.0",