black fails on python3.10 constructs

[etj]

Locally black fails on match construct, since the pyproject.toml file forces py3.7 syntax:
https://github.com/GeoNode/geonode/blob/4.3.1/pyproject.toml#L3

github workflow has been modify in order to use py310 and make the internal checks succeed:
https://github.com/GeoNode/geonode/blob/master/.github/workflows/flake8.yml#L40

• modify pyproject.toml to make black work on py310
• revert .github/workflows/flake8.yml to use global configuration