bug#53332: [version-1.4.0] python-black fails sanity-check

[Leo Famulari]

Since the version-1.4.0 merge, python-black fails the sanity-check
phase:

------
starting phase `sanity-check'
validating 'black' 
/gnu/store/s2lic2m7cxzzfc19cans1i6q494484qm-python-black-21.12b0/lib/python3.9/site-packages
...checking requirements: ERROR: black==21.12b0 ContextualVersionConflict(tomli 
2.0.0 
(/gnu/store/4k52mqy3c7dkgfmxgl21lzq3k9vx6gz5-python-tomli-2.0.0/lib/python3.9/site-packages),
 Requirement.parse('tomli<2.0.0,>=0.2.6'), {'black'})
error: in phase 'sanity-check': uncaught exception:
%exception #<&invoke-error program: "python" arguments: 
("/gnu/store/35ix1m6m8a5s21j02ajhdyqxb2xkshfb-sanity-check.py" 
"/gnu/store/s2lic2m7cxzzfc19cans1i6q494484qm-python-black-21.12b0/lib/python3.9/site-packages")
 exit-status: 1 term-signal: #f stop-signal: #f> 
phase `sanity-check' failed after 0.2 seconds
command "python" "/gnu/store/35ix1m6m8a5s21j02ajhdyqxb2xkshfb-sanity-check.py" 
"/gnu/store/s2lic2m7cxzzfc19cans1i6q494484qm-python-black-21.12b0/lib/python3.9/site-packages"
 failed with status 1
builder for 
`/gnu/store/fi5h4bk3qqyisdsp5lf35104sdaiv0vh-python-black-21.12b0.drv' failed 
with exit code 1
build of /gnu/store/fi5h4bk3qqyisdsp5lf35104sdaiv0vh-python-black-21.12b0.drv 
failed
------

Indeed, python-tomli was updated to 2.0.0, which is not considered
compatible with python-black.

This breaks 240 dependent packages.