chore(deps): update dependency google-auth to v2.2.1 (#55)

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samples/snippets/requirements-test.txt

@@ -1,4 +1,4 @@
-google-auth==2.2.0
+google-auth==2.2.1
 google-cloud-pubsub==2.8.0
 protobuf==3.18.0
 pytest==6.2.5