Bump ujson from 5.12.0 to 5.12.1

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.12.0 to 5.12.1.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.12.0...5.12.1)

---
updated-dependencies:
- dependency-name: ujson
  dependency-version: 5.12.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-3.13.txt

@@ -50,7 +50,7 @@ treq==25.5.0
 Twisted==25.5.0
 txaio==25.12.2
 typing_extensions==4.15.0
-ujson==5.12.0
+ujson==5.12.1
 unidiff==0.7.5
 urllib3==2.6.3
 Werkzeug==3.1.8