build(deps): bump flask from 3.0.3 to 3.1.0

Bumps [flask](https://github.com/pallets/flask) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.0.3...3.1.0)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -31,7 +31,7 @@ extras==1.0.0
 feedgen==1.0.0
 feedparser==6.0.11
 fixtures==4.1.0
-Flask==3.0.3
+Flask==3.1.0
 Flask-Caching==2.3.0
 flask-gae-static==1.0
 flask-sock==0.7.0