Mypy: disable attr-defined warning

Mypy warns us when we assign a not defined variable to an object, but
that is something that we are warned for from pylint (seach for
"pylint: disable=no-member" in test_updater_key_rotations.py
and you will find an example where we have to disable it).
We don't want to have two linters checking for the same thing
as we can end up disabling two warnings that are actually the same
on a single line.

Signed-off-by: Martin Vrachev <[email protected]>

Author: MVrachev

pyproject.toml

@@ -82,6 +82,7 @@ strict_equality = "True"
 disallow_untyped_defs = "True"
 disallow_untyped_calls = "True"
 show_error_codes = "True"
+disable_error_code = ["attr-defined"]
 # TODO: remove "exclude" after deleting old test files
 exclude=".*_old.py"