Bump h11 from 0.14.0 to 0.16.0 in /images/singleuser-sample

Bumps [h11](https://github.com/python-hyper/h11) from 0.14.0 to 0.16.0.
- [Commits](python-hyper/h11@v0.14.0...v0.16.0)

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

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

Author: dependabot[bot]

images/singleuser-sample/requirements.txt

@@ -63,7 +63,7 @@ fqdn==1.5.1
     # via jsonschema
 greenlet==3.1.1
     # via sqlalchemy
-h11==0.14.0
+h11==0.16.0
     # via httpcore
 httpcore==1.0.8
     # via httpx