Replace vendored `OnceLock` with dep `once_cell` #1419

Job	Run time
Test CUDA support	36s
Clippy	15s
Test build-std (aarch64-tvos)	6m 1s
MSRV (ubuntu-latest)	35s
Test build-std (aarch64-tvos-sim)	2m 56s
MSRV (windows-latest)	38s
Rustfmt	11s
Test build-std (x86_64-tvos)	4m 33s
Test (stable)	34s
Test (beta)	52s
Test (nightly)	31s
Test (linux32)	1m 6s
Test (macos)	1m 17s
Test (aarch64-macos)	53s
Test (aarch64-ios)	1m 2s
Test (win32)	1m 3s
Test (win64)	1m 5s
Test (mingw32)	1m 6s
Test (mingw64)	1m 5s
Test (windows-2019)	1m 2s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	58s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	1m 10s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 3s
	30m 32s

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