Cache compiler versions detected (#932) #1081

Job	Run time
MSRV (ubuntu-latest)	20s
MSRV (windows-latest)	40s
Test CUDA support	57s
Test aarch64-apple-tvos	2m 36s
Clippy	19s
Rustfmt	17s
Test (stable)	55s
Test (beta)	43s
Test (nightly)	26s
Test (linux32)	49s
Test (macos)	1m 1s
Test (aarch64-macos)	34s
Test (aarch64-ios)	1m 13s
Test (win32)	1m 43s
Test (win64)	1m 53s
Test (mingw32)	1m 41s
Test (mingw64)	1m 25s
Test (windows-2019)	2m 48s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 36s
	21m 56s

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