chore(deps): update dependency google-cloud-bigquery-storage to v2.3.0 (

#529)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery-storage](https://github.com/googleapis/python-bigquery-storage) | `==2.2.1` -> `==2.3.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.3.0/compatibility-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.3.0/confidence-slim/2.2.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.3.0`](https://github.com/googleapis/python-bigquery-storage/blob/master/CHANGELOG.md#&#8203;230-httpswwwgithubcomgoogleapispython-bigquery-storagecomparev221v230-2021-02-18)

[Compare Source](https://github.com/googleapis/python-bigquery-storage/compare/v2.2.1...v2.3.0)

##### Features

-   add `client_cert_source_for_mtls` argument to transports ([#&#8203;135](https://www.github.com/googleapis/python-bigquery-storage/issues/135)) ([072850d](https://www.github.com/googleapis/python-bigquery-storage/commit/072850dd341909fdc22f330117a17e48da12fdd1))

##### Documentation

-   update python contributing guide ([#&#8203;140](https://www.github.com/googleapis/python-bigquery-storage/issues/140)) ([1671056](https://www.github.com/googleapis/python-bigquery-storage/commit/1671056bfe181660440b1bf4415005e3eed01eb2))

##### [2.2.1](https://www.github.com/googleapis/python-bigquery-storage/compare/v2.2.0...v2.2.1) (2021-01-25)

##### Documentation

-   remove required session variable to fix publish ([#&#8203;124](https://www.github.com/googleapis/python-bigquery-storage/issues/124)) ([19a105c](https://www.github.com/googleapis/python-bigquery-storage/commit/19a105cb9c868bb1a9e63966609a2488876f511b))

</details>

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samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-bigquery==2.9.0
-google-cloud-bigquery-storage==2.2.1
+google-cloud-bigquery-storage==2.3.0
 google-auth-oauthlib==0.4.2
 grpcio==1.35.0
 ipython==7.16.1; python_version < '3.7'