build(deps): bump flask from 2.3.2 to 3.1.3

Bumps [flask](https://github.com/pallets/flask) from 2.3.2 to 3.1.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.3.2...3.1.3)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -7,7 +7,7 @@ certifi==2025.10.5
 charset-normalizer==2.0.12
 click==8.1.6
 cssmin==0.2.0
-Flask==2.3.2
+Flask==3.1.3
 Flask-Assets==2.0
 google-api-core==2.28.1
 google-api-python-client==2.181.0