chore: release 2.1.1 (#264)

* updated CHANGELOG.md [ci skip]

* updated package.json [ci skip]

* updated samples/package.json

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

scheduler/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 10000 --exit"
   },
   "dependencies": {
-    "@google-cloud/scheduler": "^2.1.0",
+    "@google-cloud/scheduler": "^2.1.1",
     "body-parser": "^1.18.3",
     "express": "^4.16.4"
   },