ci: re-enable MSRV all features check #1277

Job	Run time
docs	52s
clippy	1m 2s
feature-checks	2m 20s
fmt	13s
miri --no-default-features	2m 56s
miri	2m 51s
test stable --no-default-features	1m 2s
miri --all-features	3m 21s
wasm	33s
test stable	56s
test stable --all-features	1m 5s
test beta --no-default-features	1m 22s
test beta	1m 16s
test beta --all-features	1m 22s
test nightly --no-default-features	1m 34s
test nightly	1m 41s
test nightly --all-features	1m 50s
test 1.65 --no-default-features	1m 3s
test 1.65	1m 3s
test 1.65 --all-features	1m 27s
	29m 49s

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