Bump urllib3 in /examples/fastapi-background-tasks/app (#482)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.2.1 to 2.2.2.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.2.1...2.2.2)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/fastapi-background-tasks/app/requirements.txt

@@ -13,5 +13,5 @@ requests==2.32.0
 sniffio==1.3.0
 starlette==0.36.3
 typing_extensions==4.9.0
-urllib3==2.2.1
+urllib3==2.2.2
 uvicorn==0.27.0.post1