Yeah, this is my `.envrc`:

export PY=python3.9
export PANTS_PYTHON_INTERPRETER_CONSTRAINTS=[\'==3.9.*\']
export PANTS_BLACK_INTERPRETER_CONSTRAINTS=[\'==3.9.*\']
export PANTS_POETRY_INTERPRETER_CONSTRAINTS=[\'==3.9.*\']

I'm adding a TODO to upstream this tomorrow -- several Pants contributors are on M1s now