Bump flask from 2.1.1 to 2.2.1 (#3325)

Bumps [flask](https://github.com/pallets/flask) from 2.1.1 to 2.2.1.
- [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/2.1.1...2.2.1)

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

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

requirements.txt

@@ -2,7 +2,7 @@ Brotli==1.0.9
 babel==2.10.3
 certifi==2022.6.15
 flask-babel==2.0.0
-flask==2.1.1
+flask==2.2.1
 jinja2==3.1.2
 langdetect==1.0.9
 lxml==4.9.1