🧑‍🌾 ament_mypy test_mypy failures in windows repeated CI

[Crola1702]

Reference build:

• https://ci.ros2.org/job/nightly_win_rep/3656/

Test regressions:

• ament_mypy.test.test_mypy.test_mypy[1-3]
• ament_mypy.test.test_mypy.test_mypy[2-3]
• ament_mypy.test.test_mypy.test_mypy[3-3]

These test have been failing since January 25th

Log output:

_______________________________ test_mypy[1-3] ________________________________
test\test_mypy.py:21: in test_mypy
    assert rc == 0, 'Found code style errors / warnings'
E   AssertionError: Found code style errors / warnings
E   assert 1 == 0
---------------------------- Captured stdout call -----------------------------

8 files checked
2 errors
ament_mypy\main.py: note: In function "_get_files":
ament_mypy\main.py:233:45: error: "str" has no attribute "removesuffix"
Found 1 error in 1 file (checked 8 source files)

_______________________________ test_mypy[2-3] ________________________________
test\test_mypy.py:21: in test_mypy
    assert rc == 0, 'Found code style errors / warnings'
E   AssertionError: Found code style errors / warnings
E   assert 1 == 0
---------------------------- Captured stdout call -----------------------------

8 files checked
2 errors
ament_mypy\main.py: note: In function "_get_files":
ament_mypy\main.py:233:45: error: "str" has no attribute "removesuffix"
Found 1 error in 1 file (checked 8 source files)

_______________________________ test_mypy[3-3] ________________________________
test\test_mypy.py:21: in test_mypy
    assert rc == 0, 'Found code style errors / warnings'
E   AssertionError: Found code style errors / warnings
E   assert 1 == 0
---------------------------- Captured stdout call -----------------------------
8 files checked
2 errors
ament_mypy\main.py: note: In function "_get_files":
ament_mypy\main.py:233:45: error: "str" has no attribute "removesuffix"
Found 1 error in 1 file (checked 8 source files)