Add CI for minimum dependency versions and fix them #270

Job	Run time
codecov	3m 10s
clippy	1m 17s
fmt	38s
build (stable, --features "")	46s
build (stable, --all-features)	2m 4s
build (stable, --no-default-features)	1m 10s
minimal-versions	2m 13s
semver	1m 22s
test	52s
build (1.75, --features "")	46s
build (1.75, --all-features)	1m 51s
build (1.75, --no-default-features)	43s
build (beta, --features "")	46s
build (beta, --all-features)	2m 15s
build (beta, --no-default-features)	43s
build (nightly, --features "")	1m 19s
build (nightly, --all-features)	1m 55s
build (nightly, --no-default-features)	54s
	24m 44s

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