Bump actions/checkout from 4.2.0 to 4.2.1 #4321

Job	Run time
rustfmt	10s
clippy (ubuntu-20.04, --all-features)	2m 32s
all-features	0s
clippy (macos-14, --all-features)	2m 25s
deno-checks	10s
clippy (windows-latest, --no-default-features -F extensions)	7m 13s
oldstable (ubuntu-20.04)	2m 28s
oldstable (macos-14)	2m 16s
shellcheck	4s
oldstable (windows-latest)	6m 58s
test-matrix (ubuntu-20.04)	5m 35s
test-matrix (macos-14)	4m 53s
test-matrix (windows-latest, --no-default-features -F extensions)	9m 57s
test	1s
	44m 42s

Provide feedback