Bump actions/checkout in /.github/workflows in the actions group #35

Job	Run time
test / Load tox environments	5s
test / codestyle (ubuntu-latest)	17s
test / py38-test-oldestdeps (ubuntu-latest)	1m 0s
test / py39-test (macos-12)	1m 45s
test / py39-test (windows-latest)	1m 57s
test / py310-test (ubuntu-latest)	1m 2s
test / py311-test (macos-latest)	55s
test / py312-test (windows-latest)	2m 8s
test / py313-test-devdeps (ubuntu-latest)	1m 21s
publish / Build source and wheel distribution	1m 49s
	12m 19s

Provide feedback