Bug#975517: joblib fails to install with Python 3.9

[Matthias Klose]

Package: src:joblib
Version: 0.17.0-0.1
Severity: serious
Tags: sid bullseye
User: debian-python at lists.debian.org
Usertags: python3.9

[...]
Setting up python3-joblib (0.17.0-0.1) ...
  File
"/usr/lib/python3/dist-packages/joblib/test/test_func_inspect_special_encoding.py",
line 0
SyntaxError: unknown encoding: big5

dpkg: error processing package python3-joblib (--configure):
 installed python3-joblib package post-installation script subprocess returned
error exit status 1