Bump quart from 0.19.6 to 0.19.8 in /flowapi

Bumps [quart](https://github.com/pallets/quart) from 0.19.6 to 0.19.8.
- [Release notes](https://github.com/pallets/quart/releases)
- [Changelog](https://github.com/pallets/quart/blob/main/CHANGES.rst)
- [Commits](pallets/quart@0.19.6...0.19.8)

---
updated-dependencies:
- dependency-name: quart
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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