Support mypy v0.990 new Optional report

• PEP 484 prohibits implicit Optional
• Bump pre-commit hooks

added Dev Env enhancement labels

requested review from @vtexier

assigned to @moul

changed milestone to %2.0.0

changed milestone to %1.2.0

approved this merge request

added 2 commits

• c82238cb - 1 commit from branch main
• c3e72ce8 - Support mypy v0.990 new Optional report

Compare with previous version

enabled an automatic merge when the pipeline for c3e72ce8 succeeds

merged