update: update jsonschema requirement from ~=4.17.3 to ~=4.18.2

Updates the requirements on [jsonschema](https://github.com/python-jsonschema/jsonschema) to permit the latest version.
- [Release notes](https://github.com/python-jsonschema/jsonschema/releases)
- [Changelog](https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst)
- [Commits](python-jsonschema/jsonschema@v4.17.3...v4.18.2)

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

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

requirements.txt

@@ -3,7 +3,7 @@ cheroot~=10.0.0
 ecdsa~=0.18
 Flask~=2.3.2
 Jinja2~=3.1.2
-jsonschema~=4.17.3
+jsonschema~=4.18.2
 parsedatetime~=2.6
 prometheus-flask-exporter==0.22.4
 python-dateutil~=2.8.2