Bump fastjsonschema from 2.20.0 to 2.21.0 in /requirements

Bumps [fastjsonschema](https://github.com/horejsek/python-fastjsonschema) from 2.20.0 to 2.21.0.
- [Changelog](https://github.com/horejsek/python-fastjsonschema/blob/master/CHANGELOG.txt)
- [Commits](horejsek/python-fastjsonschema@v2.20.0...v2.21.0)

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

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

requirements/requirements-general.txt

@@ -1,6 +1,6 @@
 # update to newer version as soon as https://github.com/konradhalas/dacite/issues/218 is fixed
 dacite==1.7.0
-fastjsonschema==2.20.0
+fastjsonschema==2.21.0
 Flask==3.1.0
 gunicorn==23.0.0
 psycopg2==2.9.10