Bump ujson from 5.1.0 to 5.2.0 in /examples/server/sanic

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.1.0 to 5.2.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.1.0...5.2.0)

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

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

examples/server/sanic/requirements.txt

@@ -3,6 +3,6 @@ httptools==0.3.0
 multidict==5.2.0
 sanic==21.12.0
 sanic-routing==0.7.2
-ujson==5.1.0
+ujson==5.2.0
 uvloop==0.16.0
 websockets==10.1