mypy's warn_unused_ignores is unreliable, so disable it (#1213)

Discussion at python/mypy#2960

Author: jace

funnel/models/sponsor_membership.py

@@ -148,7 +148,7 @@ class __Profile:
             lazy='dynamic',
             primaryjoin=db.and_(
                 SponsorMembership.profile_id == Profile.id,
-                SponsorMembership.record_type == MEMBERSHIP_RECORD_TYPE.INVITE,
+                SponsorMembership.record_type == MEMBERSHIP_RECORD_TYPE.INVITE,  # type: ignore[has-type]
                 SponsorMembership.is_active,
             ),
             order_by=SponsorMembership.granted_at.desc(),

setup.cfg

@@ -26,5 +26,6 @@ files = **/*.py
 ignore_missing_imports = true
 show_error_codes = true
 warn_unreachable = true
-warn_unused_ignores = True
+# Unsafe with pre-commit, see https://github.com/python/mypy/issues/2960
+# warn_unused_ignores = True
 plugins = sqlmypy