chore(deps): update dependency google-auth to v2.3.1 (#192)

Co-authored-by: Anthonios Partheniou <[email protected]>

Author: renovate-bot

packages/google-cloud-build/samples/snippets/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-build==3.7.0
-google-auth==2.3.0
+google-auth==2.3.1