Revert "fix mypy errors and work around python/mypy#11852"

This reverts commit e17580a.

Author: asottile

git_code_debt/generate.py

@@ -155,8 +155,7 @@ def load_data(
                 itertools.repeat(metric_parsers),
                 itertools.repeat(exclude),
             )
-            # https://github.com/python/mypy/issues/11852
-            with mapper(jobs) as do_map:  # type: ignore
+            with mapper(jobs) as do_map:
                 for commit, metrics in zip(
                         commits, do_map(_get_metrics_inner, mp_args),
                 ):

tests/generate_test.py

@@ -61,8 +61,7 @@ def square(x):
 
 @pytest.mark.parametrize('jobs', (1, 4))
 def test_mapper(jobs):
-    # https://github.com/python/mypy/issues/11852
-    with mapper(jobs) as do_map:  # type: ignore
+    with mapper(jobs) as do_map:
         ret = tuple(do_map(square, (3, 5, 9)))
         assert ret == (9, 25, 81)