bpo-44089: Allow subclassing of ``csv.Error`` (GH-26008) (GH-26066)

* fix subclass error

* Update 2021-05-09-22-52-34.bpo-44089.IoANsN.rst
(cherry picked from commit 2b458c1dba4058c808fde25226bb2d91c5a909ca)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
3 files changed