Bump ujson from 1.35 to 2.0.3

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 1.35 to 2.0.3.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@v1.35...2.0.3)

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

requirements.txt

@@ -34,7 +34,7 @@ six==1.14.0
 transaction==3.0.0
 translationstring==1.3
 typing==3.7.4.1
-ujson==1.35
+ujson==2.0.3
 urllib3==1.25.8
 venusian==3.0.0
 waitress==1.4.3