Update to `mypy` 1.4.1

[FlorianDeconinck]

Description mypy has been running on an older version (0.812). This updates to 1.4.1 to make sure all py311 new features are being caught.

How Has This Been Tested? Running on pre-commit

Checklist:

• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings