Update fastjsonschema requirement in /tools

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@v2.15.1...v2.21.1)

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

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

tools/constraints.txt

@@ -9,7 +9,7 @@ pytest>=5.0,<8.4
 protobuf>=3.18.1,<4.0.0
 defusedxml>=0.7.1
 requests>=2.25.1
-fastjsonschema>=2.15.1,<2.18
+fastjsonschema>=2.15.1,<2.22
 coverage>=4.4.2,<=7.0.5
 astroid>=2.9.0
 pylint>=2.7.0