ci(mypy): warn_unused_ignores = True

We hit the issue at python/mypy#8823
with the Python 3.10 check for MockAwareDocTestFinder on mypy
0.971 (compiled: yes)

Author: tony

pyproject.toml

@@ -53,6 +53,7 @@ profile = "black"
 
 [tool.mypy]
 strict = true
+warn_unused_ignores = false  # mypy#8823
 
 [build-system]
 requires = ["setuptools"]