Update flask requirement from ~=3.1.0 to ~=3.1.2 in /cli

Updates the requirements on [flask](https://github.com/pallets/flask) to permit the latest version.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.1.0...3.1.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

cli/requirements.txt

@@ -24,5 +24,5 @@ PyYAML>=5.3.1,!=5.4
 tabulate>=0.8.8,<=0.9.0
 connexion~=2.15.1
 werkzeug~=3.1
-flask~=3.1.0
+flask~=3.1.2
 packaging~=25.0