build(deps): bump flask from 2.2.2 to 2.3.2 in /loadtesting (#681)

Bumps [flask](https://github.com/pallets/flask) from 2.2.2 to 2.3.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.2...2.3.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: indirect
...

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