pip(deps): bump jsonschema-specifications from 2025.4.1 to 2025.9.1

Bumps [jsonschema-specifications](https://github.com/python-jsonschema/jsonschema-specifications) from 2025.4.1 to 2025.9.1.
- [Release notes](https://github.com/python-jsonschema/jsonschema-specifications/releases)
- [Commits](python-jsonschema/jsonschema-specifications@v2025.4.1...v2025.9.1)

---
updated-dependencies:
- dependency-name: jsonschema-specifications
  dependency-version: 2025.9.1
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]