Bump flask-assets from 2.0 to 2.1.0

Bumps [flask-assets](https://github.com/miracle2k/flask-assets) from 2.0 to 2.1.0.
- [Release notes](https://github.com/miracle2k/flask-assets/releases)
- [Changelog](https://github.com/miracle2k/flask-assets/blob/master/CHANGES)
- [Commits](miracle2k/flask-assets@2.0...2.1.0)

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

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

requirements.txt

@@ -8,7 +8,7 @@ cryptography==41.0.4
 cssmin==0.2.0
 Flask==2.3.3
 Flask-APScheduler==1.13.0
-Flask-Assets==2.0
+Flask-Assets==2.1.0
 Flask-SQLAlchemy==3.1.1
 gunicorn==21.2.0
 htmlmin==0.1.12