chore(deps): bump rstest from 0.19.0 to 0.21.0 #43

Job	Run time
check no-default-features	43s
check serde	49s
check std	44s
clippy	1m 21s
docs	1m 26s
fmt	7s
test stable --no-default-features	1m 17s
test stable	1m 22s
test stable --all-features	1m 49s
test beta --no-default-features	2m 35s
test beta	2m 28s
test beta --all-features	2m 59s
test nightly --no-default-features	2m 16s
test nightly	2m 21s
test nightly --all-features	2m 27s
	24m 44s

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