Bump jsonschema from 4.19.1 to 4.20.0

Bumps [jsonschema](https://github.com/python-jsonschema/jsonschema) from 4.19.1 to 4.20.0.
- [Release notes](https://github.com/python-jsonschema/jsonschema/releases)
- [Changelog](https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst)
- [Commits](python-jsonschema/jsonschema@v4.19.1...v4.20.0)

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

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

requirements.txt

@@ -2,7 +2,7 @@ attrs==23.1.0
 certifi==2023.11.17
 chardet==5.2.0
 idna==3.6
-jsonschema==4.19.1
+jsonschema==4.20.0
 kinto-http==11.0.1
 pyrsistent==0.19.3
 requests==2.31.0