chore(deps-dev): bump @fluentui/react-migration-v0-v9

Bumps [@fluentui/react-migration-v0-v9](https://github.com/microsoft/fluentui) from 9.6.11 to 9.6.12.
- [Release notes](https://github.com/microsoft/fluentui/releases)
- [Changelog](https://github.com/microsoft/fluentui/blob/master/azure-pipelines.release.yml)
- [Commits](https://github.com/microsoft/fluentui/compare/@fluentui/react-migration-v0-v9_v9.6.11...@fluentui/react-migration-v0-v9_v9.6.12)

---
updated-dependencies:
- dependency-name: "@fluentui/react-migration-v0-v9"
  dependency-version: 9.6.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]