mypy

e6bbf5f5 - Typeshed cherry-picks: gettext and sqlite3 fixes (#12797)

Typeshed cherry-picks: gettext and sqlite3 fixes (#12797) * gettext: Make GNUTranslations.CONTEXT not final (python/typeshed#7841) * sqlite3: Avoid optional type for 'description' (python/typeshed#7842)