chore(deps): update jsonschema requirement from >=4.20 to >=4.26.0 (#266)

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@v4.20.0...v4.26.0)

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

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Author: dependabot[bot]

pyproject.toml

@@ -23,7 +23,7 @@ classifiers = [
 ]
 dependencies = [
     "pydantic>=2.0",
-    "jsonschema>=4.20",
+    "jsonschema>=4.26.0",
     # `jsonschema` treats `format` as an annotation unless a checker for that format is
     # installed. Without this, all eight `"format": "uri"` declarations in
     # schema/trace-claim.json are inert: `validate_json` builds a `FormatChecker`, the