chore(deps): bump boto3 in /examples/chatbots/python

Bumps [boto3](https://github.com/boto/boto3) from 1.38.40 to 1.40.1.
- [Release notes](https://github.com/boto/boto3/releases)
- [Commits](boto/boto3@1.38.40...1.40.1)

---
updated-dependencies:
- dependency-name: boto3
  dependency-version: 1.40.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

examples/chatbots/python/requirements.txt

@@ -1,5 +1,5 @@
 aiobotocore[boto3]==2.23.2
-boto3==1.38.40
+boto3==1.40.1
 mcp==1.12.1
 uvicorn==0.35.0