chore(deps): update dependency google-cloud-bigquery-storage to v2.1.0 (

#369)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery-storage](https://togithub.com/googleapis/python-bigquery-storage) | minor | `==2.0.1` -> `==2.1.0` |

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### Release Notes

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

### [`v2.1.0`](https://togithub.com/googleapis/python-bigquery-storage/blob/master/CHANGELOG.md#&#8203;210-httpswwwgithubcomgoogleapispython-bigquery-storagecomparev201v210-2020-11-04)

[Compare Source](https://togithub.com/googleapis/python-bigquery-storage/compare/v2.0.1...v2.1.0)

##### Features

-   add public transport property and path formatting methods to client ([#&#8203;80](https://www.github.com/googleapis/python-bigquery-storage/issues/80)) ([fbbb439](https://www.github.com/googleapis/python-bigquery-storage/commit/fbbb439b8c77fa9367a4b5bea725dd0b0f26b769))

##### Documentation

-   add intersphinx to proto-plus library ([#&#8203;86](https://www.github.com/googleapis/python-bigquery-storage/issues/86)) ([4cd35d2](https://www.github.com/googleapis/python-bigquery-storage/commit/4cd35d21de4486f659b7efc4ff4dcb9b4eee6c9e))
-   show inheritance in types reference ([#&#8203;91](https://www.github.com/googleapis/python-bigquery-storage/issues/91)) ([e5fd4e6](https://www.github.com/googleapis/python-bigquery-storage/commit/e5fd4e62de2768a49d633dc3a81e03d64df9fe1f))

##### [2.0.1](https://www.github.com/googleapis/python-bigquery-storage/compare/v2.0.0...v2.0.1) (2020-10-21)

##### Bug Fixes

-   don't fail with 429 when downloading wide tables ([#&#8203;79](https://www.github.com/googleapis/python-bigquery-storage/issues/79)) ([45faf97](https://www.github.com/googleapis/python-bigquery-storage/commit/45faf9712b25bd63d962ca7e5afc8b8d3a0d8353))

##### Documentation

-   update to_dataframe sample to latest dependencies ([#&#8203;72](https://www.github.com/googleapis/python-bigquery-storage/issues/72)) ([a7fe762](https://www.github.com/googleapis/python-bigquery-storage/commit/a7fe7626312a5b9fe1e7bd0e0fe5601ae97605c7))

</details>

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samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-bigquery==2.6.0
-google-cloud-bigquery-storage==2.0.1
+google-cloud-bigquery-storage==2.1.0
 google-auth-oauthlib==0.4.2
 grpcio==1.34.0
 ipython==7.16.1; python_version < '3.7'