build

Bump MSRV to 1.71 #101

Job	Run time
clippy	2m 0s
fmt	24s
build (stable, --features "")	47s
test	2m 22s
build (stable, --all-features)	1m 51s
build (stable, --no-default-features)	39s
build (1.71, --features "")	1m 28s
build (1.71, --all-features)	2m 42s
build (1.71, --no-default-features)	59s
build (beta, --features "")	1m 24s
build (beta, --all-features)	2m 21s
build (beta, --no-default-features)	50s
build (nightly, --features "")	53s
build (nightly, --all-features)	2m 30s
build (nightly, --no-default-features)	44s
	21m 54s

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