CI: mypy failures

[alimcmaster1]

Seeing this in multiple builds:

https://github.com/pandas-dev/pandas/runs/3972068892?check_suite_focus=true

mypy --version
mypy 0.910
Performing static analysis using mypy
pandas/core/dtypes/cast.py:913: error: Incompatible types in assignment (expression has type "ndarray[Any, dtype[Any]]", variable has type "NumpyArrayT")  [assignment]
pandas/tests/indexes/test_engines.py:65: error: unused "type: ignore" comment

Taking a look now

[simonjayhawkins]

Taking a look now

presumably we a picking up the new release of numpy 1.21.3 on ci now?

mypy failures on a new release of numpy are not unexpected. can just add "fix later" ignores on new errors and remove unused "type: ignore" to get ci to green for now.

[simonjayhawkins]

adding 1.3.5 milestone as we will probably need to backport also