Add mkdocs and sphinx to forbidden packages (#155781)

Author: cdce8p

script/hassfest/requirements.py

@@ -94,13 +94,17 @@
     "async-timeout": "be replaced by asyncio.timeout (Python 3.11+)",
     # Only needed for tests
     "codecov": "not be a runtime dependency",
+    # Only needed for docs
+    "mkdocs": "not be a runtime dependency",
     # Does blocking I/O and should be replaced by pyserial-asyncio-fast
     # See https://github.com/home-assistant/core/pull/116635
     "pyserial-asyncio": "be replaced by pyserial-asyncio-fast",
     # Only needed for tests
     "pytest": "not be a runtime dependency",
     # Only needed for build
     "setuptools": "not be a runtime dependency",
+    # Only needed for docs
+    "sphinx": "not be a runtime dependency",
     # Only needed for build
     "wheel": "not be a runtime dependency",
 }