build(deps): bump jsonschema from 4.18.2 to 4.18.3

Bumps [jsonschema](https://github.com/python-jsonschema/jsonschema) from 4.18.2 to 4.18.3.
- [Release notes](https://github.com/python-jsonschema/jsonschema/releases)
- [Changelog](https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/python-jsonschema/jsonschema/compare/v4.18.2...v4.18.3)

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

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

requirements.txt

@@ -48,7 +48,7 @@ humanize==4.7.0
 idna==3.4
 itsdangerous==2.1.2
 Jinja2==3.1.2
-jsonschema==4.18.2
+jsonschema==4.18.3
 lxml==4.9.3
 MarkupSafe==2.1.3
 mf2py==1.1.3