Bump MSRV to 1.63 #1539

Job	Run time
Cross (aarch64-unknown-linux-gnu)	35s
Cross (powerpc-unknown-linux-gnu)	27s
iOS Simulator	5m 4s
Sanitizer	42s
Linux (x86_64-unknown-linux-musl)	17s
Cross (wasm32-unknown-emscripten)	37s
Linux (i686-unknown-linux-musl)	37s
Windows (stable-x86_64-gnu)	41s
Windows 7 (on Windows 10)	1m 36s
Linux (i686-unknown-linux-gnu, libc6-dev-i386 lib32gcc-11-dev)	28s
Linux (x86_64-unknown-linux-gnux32, libc6-dev-x32 libx32gcc-11-dev, --no-run)	29s
Windows (stable-i686-gnu)	55s
FreeBSD VM	2m 30s
Windows (stable-i686-msvc)	1m 7s
NetBSD VM	2m 55s
OpenBSD VM	1m 56s
WASI	22s
Web	1m 27s
Tier 1 (ubuntu-22.04, nightly)	21s
Tier 1 (ubuntu-22.04, beta)	24s
Tier 1 (ubuntu-22.04, stable)	26s
Tier 1 (ubuntu-22.04, 1.63)	2m 6s
Tier 1 (windows-2022, nightly)	40s
Tier 1 (windows-2022, beta)	44s
Tier 1 (windows-2022, stable)	1m 26s
Tier 1 (windows-2022, 1.63)	2m 40s
Tier 1 (macos-14, stable)	21s
	31m 53s

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