Configure Poetry to install venv inside the project,
update mypy, update other dependencies with current constraints,
update GitHub Actions so it can cache .venv, use GitHub Actions
to install Poetry, configure to run CI/CD only for pull_request
and push to main, remove python3.6.
Configure Poetry to install venv inside the project, update
mypy, update other dependencies with current constraints, update GitHub Actions so it can cache .venv, use GitHub Actions to install Poetry, configure to run CI/CD only forpull_requestandpushtomain, removepython3.6.