Remove nightly toolchain (-Zlints had been stablized since 1.74) #86

Job	Run time
build / Build Linux (no features)	31s
build / Build MacOS (arm64)	1m 18s
build / Build Linux	1m 51s
build / Build MacOS (x86_64)	2m 56s
build / Build Windows	4m 23s
build / Run linters	1m 7s
	12m 6s

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