build(deps): bump orjson in /samples/server/petstore/python-fastapi

Bumps [orjson](https://github.com/ijl/orjson) from 3.9.15 to 3.11.6.
- [Release notes](https://github.com/ijl/orjson/releases)
- [Changelog](https://github.com/ijl/orjson/blob/master/CHANGELOG.md)
- [Commits](ijl/orjson@3.9.15...3.11.6)

---
updated-dependencies:
- dependency-name: orjson
  dependency-version: 3.11.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/server/petstore/python-fastapi/requirements.txt

@@ -18,7 +18,7 @@ idna==3.7
 itsdangerous==1.1.0
 Jinja2==3.1.4
 MarkupSafe==2.0.1
-orjson==3.9.15
+orjson==3.11.6
 promise==2.3
 pydantic>=2
 python-dotenv==0.17.1