pytest-enabler is not needed to run tests.

--- jaraco_functools-4.4.0/tox.ini.orig
+++ jaraco_functools-4.4.0/tox.ini
@@ -8,7 +8,6 @@
 usedevelop = True
 extras =
 	test
-	enabler
 passenv =
 	GITHUB_ACTIONS