chore(deps): update actions/checkout action to v4 #693

Job	Run time
test-development-versions-deps	56s
test-latest-version	1m 59s
test-linter	22s
test-no-erdantic-version	1m 8s
test-stable-versions (3.8, 20, 45)	1m 27s
test-stable-versions (3.9, 20, 45)	1m 22s
test-stable-versions (3.9, 20, 53)	1m 26s
test-stable-versions (3.10, 20, 62)	1m 24s
test-stable-versions (3.10, 20, 70)	1m 29s
test-stable-versions (3.11, 20, 70)	1m 41s
test-stable-versions (3.11, 21, 71)	1m 19s
test-stable-versions (3.11, 22, 71)	1m 18s
test-stable-versions (3.11, 23, 71)	1m 19s
test-stable-versions (3.11, 24, 72)	1m 17s
test-stable-versions (3.12, 25, 72)	1m 44s
test-stable-versions (3.12, 26, 72)	1m 35s
	21m 46s

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