Bump @google-cloud/bigquery from 7.9.3 to 7.9.4 (#321)

Bumps [@google-cloud/bigquery](https://github.com/googleapis/nodejs-bigquery) from 7.9.3 to 7.9.4.
- [Release notes](https://github.com/googleapis/nodejs-bigquery/releases)
- [Changelog](https://github.com/googleapis/nodejs-bigquery/blob/main/CHANGELOG.md)
- [Commits](googleapis/nodejs-bigquery@v7.9.3...v7.9.4)

---
updated-dependencies:
- dependency-name: "@google-cloud/bigquery"
  dependency-version: 7.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]