chore(deps): update dependency google-cloud-bigquery-storage to v2.0.1 (#337)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery-storage](https://togithub.com/googleapis/python-bigquery-storage) | patch | `==2.0.0` -> `==2.0.1` |

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### Release Notes

<details>
<summary>googleapis/python-bigquery-storage</summary>

### [`v2.0.1`](https://togithub.com/googleapis/python-bigquery-storage/blob/master/CHANGELOG.md#&#8203;201-httpswwwgithubcomgoogleapispython-bigquery-storagecomparev200v201-2020-10-21)

[Compare Source](https://togithub.com/googleapis/python-bigquery-storage/compare/v2.0.0...v2.0.1)

</details>

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samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-bigquery==2.1.0
-google-cloud-bigquery-storage==2.0.0
+google-cloud-bigquery-storage==2.0.1
 google-auth-oauthlib==0.4.2
 grpcio==1.33.2
 ipython==7.16.1; python_version < '3.7'