Bump h11 in /samples/server/petstore/python-fastapi

Bumps [h11](https://github.com/python-hyper/h11) from 0.12.0 to 0.16.0.
- [Commits](python-hyper/h11@v0.12.0...v0.16.0)

---
updated-dependencies:
- dependency-name: h11
  dependency-version: 0.16.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -11,7 +11,7 @@ fastapi==0.115.2
 graphene==2.1.8
 graphql-core==2.3.2
 graphql-relay==2.0.1
-h11==0.12.0
+h11==0.16.0
 httptools>=0.3.0,<0.7.0
 httpx==0.24.1
 idna==3.7