chore(deps): update dependency google-cloud-bigquery to v2.25.0 (#907)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery](https://github.com/googleapis/python-bigquery) | `==2.24.1` -> `==2.25.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.25.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.25.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.25.0/compatibility-slim/2.24.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.25.0/confidence-slim/2.24.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.25.0`](https://github.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;2250-httpswwwgithubcomgoogleapispython-bigquerycomparev2241v2250-2021-08-24)

[Compare Source](https://github.com/googleapis/python-bigquery/compare/v2.24.1...v2.25.0)

##### Features

-   Support using GeoPandas for GEOGRAPHY columns ([#&#8203;848](https://www.github.com/googleapis/python-bigquery/issues/848)) ([16f65e6](https://www.github.com/googleapis/python-bigquery/commit/16f65e6ae15979217ceea6c6d398c9057a363a13))

##### [2.24.1](https://www.github.com/googleapis/python-bigquery/compare/v2.24.0...v2.24.1) (2021-08-13)

##### Bug Fixes

-   remove pytz dependency and require pyarrow>=3.0.0 ([#&#8203;875](https://www.github.com/googleapis/python-bigquery/issues/875)) ([2cb3563](https://www.github.com/googleapis/python-bigquery/commit/2cb3563ee863edef7eaf5d04d739bcfe7bc6438e))

</details>

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samples/geography/requirements.txt

@@ -12,7 +12,7 @@ geojson==2.5.0
 geopandas==0.9.0
 google-api-core==1.31.2
 google-auth==1.35.0
-google-cloud-bigquery==2.24.1
+google-cloud-bigquery==2.25.0
 google-cloud-bigquery-storage==2.6.3
 google-cloud-core==2.0.0
 google-crc32c==1.1.2

samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-bigquery==2.24.1
+google-cloud-bigquery==2.25.0
 google-cloud-bigquery-storage==2.6.3
 google-auth-oauthlib==0.4.5
 grpcio==1.39.0