Bump ujson from 5.2.0 to 5.4.0 in /frameworks/Python/japronto

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.2.0 to 5.4.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](https://github.com/ultrajson/ultrajson/compare/5.2.0...5.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

frameworks/Python/japronto/requirements_postgres.txt

@@ -1,3 +1,3 @@
 git+https://github.com/IterableTrucks/japronto.git@0d848d96dd010f6701729b14e6b8ec0330002b5c
 asyncpg==0.25.0
-ujson==5.2.0
+ujson==5.4.0