We have no html5lib packaged yet.

--- beautifulsoup4-4.12.3/tox.ini.orig
+++ beautifulsoup4-4.12.3/tox.ini
@@ -9,7 +9,6 @@
 wheel_build_env = .pkg
 description = run the tests with all dependencies installed
 deps = lxml
-     html5lib
      soupsieve>=1.2
      pytest>=6
 commands = pytest {tty:--color=yes} {posargs}