Update action to node20 (actions#772)

Update action to node20 (actions#772)

update actions/checkout to v4 (actions#761)

Add range validation for toml files (actions#726)

Add range validation for toml files (actions#726)

Fix typos found by codespell (actions#650)

Add warning for python 2.7 on release/v3 (actions#674)

* add warning

* npm run format

* remove ubuntu-18.04

Add warning for python 2.7 on release/v3 (actions#674)

* add warning

* npm run format

* remove ubuntu-18.04

Add warning for python 2.7 on release/v2 (actions#675)

* add warning

* remove ubuntu-18.04

* remove macos-10.15

* fix pypy3

Add warning for python 2.7 on release/v2 (actions#675)

* add warning

* remove ubuntu-18.04

* remove macos-10.15

* fix pypy3