Bump urllib3 in /examples/fastapi-response-streaming/app (#485)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.18 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.18...1.26.19)

---
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-response-streaming/app/requirements.txt

@@ -16,5 +16,5 @@ six==1.16.0
 sniffio==1.3.0
 starlette==0.36.3
 typing_extensions==4.8.0
-urllib3==1.26.18
+urllib3==1.26.19
 uvicorn==0.23.2