build(npm): bump @salesforce/sfdx-lwc-jest from 7.8.0 to 7.9.0 (#460)

Bumps [@salesforce/sfdx-lwc-jest](https://github.com/salesforce/sfdx-lwc-jest) from 7.8.0 to 7.9.0.
- [Release notes](https://github.com/salesforce/sfdx-lwc-jest/releases)
- [Changelog](https://github.com/salesforce/sfdx-lwc-jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/salesforce/sfdx-lwc-jest/commits)

---
updated-dependencies:
- dependency-name: "@salesforce/sfdx-lwc-jest"
  dependency-version: 7.9.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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