Update fastjsonschema requirement from ~=2.17.1 to ~=2.20.0 in /tests

Updates the requirements on [fastjsonschema](https://github.com/horejsek/python-fastjsonschema) to permit the latest version.
- [Changelog](https://github.com/horejsek/python-fastjsonschema/blob/master/CHANGELOG.txt)
- [Commits](horejsek/python-fastjsonschema@v2.17.1...v2.20.0)

---
updated-dependencies:
- dependency-name: fastjsonschema
  dependency-type: direct:production
...

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

tests/constraints.txt

@@ -9,7 +9,7 @@ PyYAML>=5.4.1
 scipy>=1.7
 wheel>=0.38.1
 defusedxml>=0.7.1
-fastjsonschema~=2.17.1
+fastjsonschema~=2.20.0
 test-generator==0.1.2
 requests>=2.25.1
 opencv-python>=4.5