tox: fix lintreadme folder, removed unneeded installs

Author: mr-c

tox.ini

@@ -63,8 +63,7 @@ setenv =
   HOME = {envtmpdir}
 
 commands_pre =
-  py3{10,11,12,13}-unit: python -m pip install -U pip setuptools wheel
-  py312-lintreadme: python -m build --outdir {distdir}
+  py312-lintreadme: python -m build --outdir {pkg_dir}
 
 commands =
   py3{10,11,12,13,14}-unit: make coverage-report coverage.xml PYTEST_EXTRA="{posargs}"
@@ -73,7 +72,7 @@ commands =
   py3{10,11,12,13,14}-mypy: make mypy mypyc PYTEST_EXTRA="{posargs}"
   py312-shellcheck: make shellcheck
   py312-pydocstyle: make diff_pydocstyle_report
-  py312-lintreadme: twine check {distdir}/*
+  py312-lintreadme: twine check {pkg_dir}/*
 
 skip_install =
   py3{10,11,12,13,14}-{bandit,lint,mypy,shellcheck,pydocstyle,lintreadme}: true