Bump msrv to 1.63 (#1031) #1416

Job	Run time
MSRV (ubuntu-latest)	1m 37s
Test (stable)	1m 11s
MSRV (windows-latest)	2m 5s
Test (beta)	1m 15s
Test (nightly)	1m 13s
Test (linux32)	1m 30s
Test CUDA support	23s
Test (macos)	4m 14s
Test build-std (aarch64-tvos)	2m 32s
Clippy	14s
Test (aarch64-macos)	1m 16s
Test build-std (aarch64-tvos-sim)	2m 39s
Test (aarch64-ios)	2m 23s
Test build-std (x86_64-tvos)	3m 53s
Rustfmt	10s
Test (win32)	2m 37s
Test (win64)	2m 35s
Test (mingw32)	3m 0s
Test (mingw64)	2m 44s
Test (windows-2019)	2m 58s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 35s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 35s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	3m 5s
	49m 44s

Provide feedback