Bump h11 from 0.11.0 to 0.16.0 in /examples/server/asgi

Bumps [h11](https://github.com/python-hyper/h11) from 0.11.0 to 0.16.0.
- [Commits](https://github.com/python-hyper/h11/compare/v0.11.0...v0.16.0)

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

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

examples/server/asgi/requirements.txt

@@ -1,5 +1,5 @@
 Click==7.1.2
-h11==0.11.0
+h11==0.16.0
 httptools==0.1.1
 python-engineio
 python_socketio