Bump approvaltests from 12.1.0 to 12.2.0 in /flowmachine

Bumps [approvaltests](https://github.com/approvals/ApprovalTests.Python) from 12.1.0 to 12.2.0.
- [Release notes](https://github.com/approvals/ApprovalTests.Python/releases)
- [Commits](approvals/ApprovalTests.Python@v12.1.0...v12.2.0)

---
updated-dependencies:
- dependency-name: approvaltests
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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