chore(deps): bump uvicorn in /examples/chatbots/python

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.34.2 to 0.34.3.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/docs/release-notes.md)
- [Commits](encode/uvicorn@0.34.2...0.34.3)

---
updated-dependencies:
- dependency-name: uvicorn
  dependency-version: 0.34.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

examples/chatbots/python/requirements.txt

@@ -1,6 +1,6 @@
 aiobotocore[boto3]==2.22.0
 mcp==1.9.2
-uvicorn==0.34.2
+uvicorn==0.34.3
 
 # For testing, this module is installed from local files.
 # Uncomment this line to build using the module from PyPi