Upgrade artifact actions and standardise checkout & setup python acti… · heiner/nle@fd7d353

[notice] A new release of pip is available: 21.1.1 -> 24.2 [notice] To update, run: python3.8 -m pip install --upgrade pip

Treating cmake as a formula. For the cask, use homebrew/cask/cmake or specify the `--cask` flag. To silence this message, use the `--formula` flag.

cmake 3.30.4 is already installed and up-to-date. To reinstall 3.30.4, run: brew reinstall cmake