chore(deps): update dependency google-cloud-bigquery to v2.22.0 (#208)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery](https://togithub.com/googleapis/python-bigquery) | `==2.21.0` -> `==2.22.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.22.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.22.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.22.0/compatibility-slim/2.21.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery/2.22.0/confidence-slim/2.21.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.22.0`](https://togithub.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;2220-httpswwwgithubcomgoogleapispython-bigquerycomparev2210v2220-2021-07-19)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v2.21.0...v2.22.0)

##### Features

-   add `LoadJobConfig.projection_fields` to select DATASTORE_BACKUP fields ([#&#8203;736](https://www.github.com/googleapis/python-bigquery/issues/736)) ([c45a738](https://www.github.com/googleapis/python-bigquery/commit/c45a7380871af3dfbd3c45524cb606c60e1a01d1))
-   add standard sql table type, update scalar type enums ([#&#8203;777](https://www.github.com/googleapis/python-bigquery/issues/777)) ([b8b5433](https://www.github.com/googleapis/python-bigquery/commit/b8b5433898ec881f8da1303614780a660d94733a))
-   add support for more detailed DML stats ([#&#8203;758](https://www.github.com/googleapis/python-bigquery/issues/758)) ([36fe86f](https://www.github.com/googleapis/python-bigquery/commit/36fe86f41c1a8f46167284f752a6d6bbf886a04b))
-   add support for user defined Table View Functions ([#&#8203;724](https://www.github.com/googleapis/python-bigquery/issues/724)) ([8c7b839](https://www.github.com/googleapis/python-bigquery/commit/8c7b839a6ac1491c1c3b6b0e8755f4b70ed72ee3))

##### Bug Fixes

-   avoid possible job already exists error ([#&#8203;751](https://www.github.com/googleapis/python-bigquery/issues/751)) ([45b9308](https://www.github.com/googleapis/python-bigquery/commit/45b93089f5398740413104285cc8acfd5ebc9c08))

##### Dependencies

-   allow 2.x versions of `google-api-core`, `google-cloud-core`, `google-resumable-media` ([#&#8203;770](https://www.github.com/googleapis/python-bigquery/issues/770)) ([87a09fa](https://www.github.com/googleapis/python-bigquery/commit/87a09fa3f2a9ab35728a1ac925f9d5f2e6616c65))

##### Documentation

-   add loading data from Firestore backup sample ([#&#8203;737](https://www.github.com/googleapis/python-bigquery/issues/737)) ([22fd848](https://www.github.com/googleapis/python-bigquery/commit/22fd848cae4af1148040e1faa31dd15a4d674687))

</details>

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samples/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-dlp==3.2.0
 google-cloud-storage==1.41.0
 google-cloud-pubsub==2.6.1
 google-cloud-datastore==2.1.4
-google-cloud-bigquery==2.21.0
+google-cloud-bigquery==2.22.0