Tests failing - github actions pre-commit, mypy - error: "TypeAliasType" not callable

[flicj191]

Tests have started failing on 22 June with:

mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

esmvalcore/preprocessor/_time.py:1773: error: "TypeAliasType" not callable  [operator]
tests/unit/preprocessor/test_shared.py:442: error: "TypeAliasType" not callable  [operator]
tests/unit/preprocessor/test_shared.py:459: error: "TypeAliasType" not callable  [operator]
Found 3 errors in 2 files (checked 625 source files)

see here
for run-tests

For np.ma.masked_array in affected files, additional dependencies for mypy have numpy

I can update the identified files.