Bump msrv to 1.63 #1411

Job	Run time
Test CUDA support	18s
Test build-std (aarch64-tvos)	5m 22s
Test build-std (aarch64-tvos-sim)	5m 10s
Clippy	17s
MSRV (ubuntu-latest)	1m 34s
Test build-std (x86_64-tvos)	5m 16s
MSRV (windows-latest)	1m 57s
Rustfmt	7s
Test (stable)	56s
Test (beta)	59s
Test (nightly)	1m 5s
Test (linux32)	1m 16s
Test (macos)	1m 6s
Test (aarch64-macos)	59s
Test (aarch64-ios)	1m 7s
Test (win32)	1m 3s
Test (win64)	1m 1s
Test (mingw32)	1m 2s
Test (mingw64)	1m 2s
Test (windows-2019)	1m 1s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	59s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	1m 1s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 1s
	35m 39s

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