We have no html5lib packaged yet.

--- soupsieve-4.0.1/pyproject.toml.orig
+++ soupsieve-4.0.1/pyproject.toml
@@ -121,7 +121,6 @@
     "build",
     "beautifulsoup4",
     "lxml",
-    "html5lib"
 ]
 
 [tool.hatch.envs.dev-stdlib]