Bump flask in /libraries/functional-tests/functionaltestbot (#1993)

Bumps [flask](https://github.com/pallets/flask) from 1.1.1 to 2.2.5.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@1.1.1...2.2.5)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
...

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

Author: dependabot[bot]

libraries/functional-tests/functionaltestbot/requirements.txt

@@ -2,4 +2,4 @@
 # Licensed under the MIT License.
 
 botbuilder-core>=4.9.0
-flask==1.1.1
+flask==2.2.5