Bump msrv to 1.63 #1413

Job	Run time
Test build-std (aarch64-tvos)	5m 31s
Test (stable)	1m 5s
Test build-std (aarch64-tvos-sim)	2m 46s
Clippy	12s
Test build-std (x86_64-tvos)	3m 56s
Test (beta)	1m 11s
Test (nightly)	1m 16s
Test CUDA support	28s
Test (linux32)	1m 24s
MSRV (ubuntu-latest)	1m 38s
Test (macos)	2m 23s
MSRV (windows-latest)	2m 9s
Rustfmt	8s
Test (aarch64-macos)	1m 23s
Test (aarch64-ios)	2m 10s
Test (win32)	2m 40s
Test (win64)	2m 32s
Test (mingw32)	2m 49s
Test (mingw64)	2m 52s
Test (windows-2019)	3m 11s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 30s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 14s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 6s
	50m 34s

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