Turn off mypy --warn-unused-ignores temporarily

mypy 1.11.0 complains about unused type: ignore statements
that are required by earlier versions, causing failures.
This commit should be reverted once the CI system has moved
to using the newer version of mypy (at which time the type:
ignore statements that cause the failure will have to be
removed).

setup.cfg

@@ -47,7 +47,8 @@ check_untyped_defs = True
 exclude = build|docs|.venv|venv
 warn_unused_configs = True
 warn_redundant_casts = True
-warn_unused_ignores = True
+# Temporarily disable during transition to mypy 1.11.0
+#warn_unused_ignores = True
 no_implicit_optional = True
 strict_equality = True
 extra_checks = True