make tests without pytz run

tox.ini

@@ -20,15 +20,11 @@ commands =
 usedevelop = False
 # use lowest version
 basepython = python3.8
-allowlist_externals =
-    rm
 deps =
-    setuptools>=70.1.0
     pytest
     coverage
     hypothesis
 commands =
-    rm -rf build # do not mess up import
     coverage run --branch --source=src/icalendar --omit=*/tests/hypothesis/* --omit=*/tests/fuzzed/* --module pytest []
     coverage report
     coverage html