Remove redundant black hook & specify minimal supported python version for hooks

[tdadela]

Description

1. Remove redundant black hook introduced in 7128c01
2. Specify minimal supported python version for hooks – black & isort.
   isort:

--py {all,2,27,3,310,35,36,37,38,39,auto}, --python-version {all,2,27,3,310,35,36,37,38,39,auto}
Tells isort to set the known standard library based on the specified Python version.
Default is to assume any Python 3 version could be the target, and use a union of all stdlib modules across versions.
If auto is specified, the version of the interpreter used to run isort (currently: 311) will be used.

black:

  -t, --target-version [py33|py34|py35|py36|py37|py38|py39|py310|py311]
                                  Python versions that should be supported by
                                  Black's output. [default: per-file auto-
                                  detection]

[jeertmans]

Nice catch @tdadela, and that’s a good idea to specify the minimal Python version for all CI tools.

Many thanks for your contribution, merging this!