chore(deps): update dependency grpcio to v1.27.2 [(#3173)](GoogleClou…

…dPlatform/python-docs-samples#3173)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grpcio](https://grpc.io) | minor | `==1.25.0` -> `==1.27.2` |
| [grpcio](https://grpc.io) | minor | `==1.23.0` -> `==1.27.2` |
| [grpcio](https://grpc.io) | minor | `==1.26.0` -> `==1.27.2` |
| [grpcio](https://grpc.io) | patch | `==1.27.1` -> `==1.27.2` |

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samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-grpcio==1.27.1
+grpcio==1.27.2
 google-auth==1.11.2
 google-auth-httplib2==0.0.3
 google-cloud==0.34.0