Remove bits of tox config that are efficient

This should resolve a failure in CI caused by Python 3.6.

Author: kurtmckee

tox.ini

@@ -1,6 +1,4 @@
 [tox]
-min_version = 4.3.5
-
 envlist =
     coverage_erase
     py{3.13, 3.12, 3.11, 3.10, 3.9, 3.8, 3.7, 3.6}
@@ -11,9 +9,6 @@ isolated_build = True
 
 
 [testenv]
-package = wheel
-wheel_build_env = build_wheel
-
 depends =
     py{3.13, 3.12, 3.11, 3.10, 3.9, 3.8, 3.7, 3.6}: coverage_erase
 deps =