Bump google-cloud-bigquery from 2.11.0 to 2.12.0 (#39)

Bumps [google-cloud-bigquery](https://github.com/googleapis/python-bigquery) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/googleapis/python-bigquery/releases)
- [Changelog](https://github.com/googleapis/python-bigquery/blob/master/CHANGELOG.md)
- [Commits](googleapis/python-bigquery@v2.11.0...v2.12.0)

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requirements.txt

@@ -2,4 +2,4 @@ click==7.1.2
 pydantic==1.8.1
 
 #bigquery
-google-cloud-bigquery==2.11.0
+google-cloud-bigquery==2.12.0