build(deps): bump flask from 2.1.0 to 2.1.1

Bumps [flask](https://github.com/pallets/flask) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/flask/compare/2.1.0...2.1.1)

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

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

requirements.txt

@@ -18,7 +18,7 @@ extras==1.0.0
 feedgen==0.9.0
 feedparser==6.0.8
 fixtures==3.0.0
-Flask==2.1.0
+Flask==2.1.1
 Flask-Caching==1.10.1
 flask-gae-static==0.2
 google-api-core==1.31.5