Bump ujson in /src/test/python_tests in the pip group across 1 directory (#119)

Bumps the pip group with 1 update in the /src/test/python_tests directory: [ujson](https://github.com/ultrajson/ultrajson).


Updates `ujson` from 5.11.0 to 5.12.0
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.11.0...5.12.0)

---
updated-dependencies:
- dependency-name: ujson
  dependency-version: 5.12.0
  dependency-type: indirect
  dependency-group: pip
...

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Author: dependabot[bot]