chore(deps): update dependency google-cloud-bigquery-storage to v2.6.3 (

#863)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery-storage](https://togithub.com/googleapis/python-bigquery-storage) | `==2.6.2` -> `==2.6.3` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.6.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.6.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.6.3/compatibility-slim/2.6.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-storage/2.6.3/confidence-slim/2.6.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.6.3`](https://togithub.com/googleapis/python-bigquery-storage/blob/master/CHANGELOG.md#​263-httpswwwgithubcomgoogleapispython-bigquery-storagecomparev262v263-2021-08-06)

[Compare Source](https://togithub.com/googleapis/python-bigquery-storage/compare/v2.6.2...v2.6.3)

</details>

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samples/geography/requirements.txt

@@ -1,4 +1,4 @@
 geojson==2.5.0
 google-cloud-bigquery==2.23.3
-google-cloud-bigquery-storage==2.6.2
+google-cloud-bigquery-storage==2.6.3
 Shapely==1.7.1

samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-bigquery==2.23.3
-google-cloud-bigquery-storage==2.6.2
+google-cloud-bigquery-storage==2.6.3
 google-auth-oauthlib==0.4.5
 grpcio==1.39.0
 ipython==7.16.1; python_version < '3.7'