Update flask-assets requirement from <2.1.0,>=0.12 to >=0.12,<2.2.0 (#…

…447)

Updates the requirements on [flask-assets](https://github.com/miracle2k/flask-assets) to permit the latest version.
- [Release notes](https://github.com/miracle2k/flask-assets/releases)
- [Changelog](https://github.com/miracle2k/flask-assets/blob/master/CHANGES)
- [Commits](miracle2k/flask-assets@0.12...2.1.0)

---
updated-dependencies:
- dependency-name: flask-assets
  dependency-type: direct:production
...

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

requirements.txt

@@ -8,7 +8,7 @@ gunicorn
 cryptography==42.0.4
 
 # Flask Extensions
-Flask-Assets>=0.12,<2.1.0
+Flask-Assets>=0.12,<2.2.0
 
 # Branch that contains a Unicode bug fix - use until https://github.com/miracle2k/webassets/pull/482 is published
 webassets==2.0