Update websockets requirement from >=8.1,<15.0 to >=8.1,<16.0

Updates the requirements on [websockets](https://github.com/python-websockets/websockets) to permit the latest version.
- [Release notes](https://github.com/python-websockets/websockets/releases)
- [Commits](python-websockets/websockets@8.1...15.0)

---
updated-dependencies:
- dependency-name: websockets
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -74,7 +74,7 @@ python-dateutil = ">=2.8.2"
 ruyaml = ">=0.91.0"
 python = "^3.9.0"
 voluptuous = ">=0.13.1"
-websockets = ">=8.1,<15.0"
+websockets = ">=8.1,<16.0"
 
 [tool.poetry.dev-dependencies]
 Sphinx = "^7.1.2"