Bump orjson from 3.9.10 to 3.9.15 in /frameworks/Python/heaven

Bumps [orjson](https://github.com/ijl/orjson) from 3.9.10 to 3.9.15.
- [Release notes](https://github.com/ijl/orjson/releases)
- [Changelog](https://github.com/ijl/orjson/blob/master/CHANGELOG.md)
- [Commits](ijl/orjson@3.9.10...3.9.15)

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

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

Author: dependabot[bot]

frameworks/Python/heaven/requirements.txt

@@ -1,4 +1,4 @@
 asyncpg==0.29.0
 heaven==0.2.4
-orjson==3.9.10
+orjson==3.9.15
 gunicorn==20.1.0