Remove nightly toolchain (-Zlints had been stablized since 1.74) #83

Job	Run time
build / Run linters	30s
build / Build Linux (no features)	25s
build / Build MacOS (arm64)	1m 17s
build / Build Linux	1m 40s
build / Build MacOS (x86_64)	1m 52s
build / Build Windows	2m 41s
	8m 25s

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