chore(deps): update dependency google-cloud-bigquery to v2.6.1 (#86)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery](https://github.com/googleapis/python-bigquery) | patch | `==2.6.0` -> `==2.6.1` |

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### Release Notes

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

### [`v2.6.1`](https://github.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;261-httpswwwgithubcomgoogleapispython-bigquerycomparev260v261-2020-12-09)

[Compare Source](https://github.com/googleapis/python-bigquery/compare/v2.6.0...v2.6.1)

</details>

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dlp/snippets/requirements.txt

@@ -2,4 +2,4 @@ google-cloud-dlp==3.0.0
 google-cloud-storage==1.33.0
 google-cloud-pubsub==1.7.0
 google-cloud-datastore==1.15.3
-google-cloud-bigquery==2.6.0
+google-cloud-bigquery==2.6.1