Rust

Update MSRV to 1.60 from 1.56 #516

Job	Run time
cross_compile_aarch64 (1.6)	2m 33s
build_test (i586-pc-windows-msvc, 1.60.0, windows-latest)	2m 59s
cross_compile_aarch64 (1.6, std)	2m 33s
build_test (i586-pc-windows-msvc, stable, windows-latest)	1m 16s
cross_compile_aarch64 (stable)	59s
build_test (i586-pc-windows-msvc, beta, windows-latest)	51s
cross_compile_aarch64 (stable, std)	37s
build_test (i586-pc-windows-msvc, nightly, windows-latest)	53s
cross_compile_aarch64 (nightly)	43s
build_test (i686-pc-windows-msvc, 1.60.0, windows-latest)	3m 9s
cross_compile_aarch64 (nightly, std)	32s
build_test (i686-pc-windows-msvc, stable, windows-latest)	59s
build_test (i686-pc-windows-msvc, beta, windows-latest)	59s
build_test (i686-pc-windows-msvc, nightly, windows-latest)	59s
build_test (x86_64-pc-windows-msvc, 1.60.0, windows-latest)	3m 8s
build_test (x86_64-pc-windows-msvc, stable, windows-latest)	54s
build_test (x86_64-pc-windows-msvc, beta, windows-latest)	48s
build_test (x86_64-pc-windows-msvc, nightly, windows-latest)	52s
build_test (wasm32-wasi, 1.60.0, ubuntu-latest, v5.0.0)	2m 29s
build_test (wasm32-wasi, stable, ubuntu-latest, v5.0.0)	33s
build_test (wasm32-wasi, beta, ubuntu-latest, v5.0.0)	35s
build_test (wasm32-wasi, nightly, ubuntu-latest, v5.0.0)	32s
	29m 53s

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