Update jsonschema requirement from ~=4.25 to ~=4.26

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](https://github.com/python-jsonschema/jsonschema/compare/v4.25.0...v4.26.0)

---
updated-dependencies:
- dependency-name: jsonschema
  dependency-version: 4.26.0
  dependency-type: direct:production
...

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

requirements.txt

@@ -100,7 +100,7 @@ pytest-flask ~=1.3
 pytest-mock ~=3.15
 
 # Anything 4.0 and up but not 5.0
-jsonschema ~= 4.25
+jsonschema ~= 4.26
 
 # OpenAPI validation support
 openapi-core[flask] >= 0.19.0