TYP: update setup.cfg (#34688)

Author: simonjayhawkins

setup.cfg

@@ -136,9 +136,6 @@ check_untyped_defs=False
 [mypy-pandas.conftest]
 ignore_errors=True
 
-[mypy-pandas.tests.arithmetic.test_datetime64]
-ignore_errors=True
-
 [mypy-pandas.tests.tools.test_to_datetime]
 ignore_errors=True
 
@@ -303,6 +300,3 @@ check_untyped_defs=False
 
 [mypy-pandas.tseries.holiday]
 check_untyped_defs=False
-
-[mypy-pandas.tseries.offsets]
-check_untyped_defs=False