Update wasi-libc submodule (#625) #1159

Job	Run time
Build only sysroot - default	15m 46s
Build x86_64-macos	4m 49s
Build arm64-macos	29m 57s
Build riscv64-linux	5m 21s
Build x86_64-linux	33m 44s
Build x86_64-windows	1h 6m 51s
Build arm64-windows	6h 5m 0s
Build arm64-linux	26m 19s
Build only sysroot - exceptions	16m 46s
Test standalone toolchain	0s
Finalize wasi-sdk artifacts	-1s
	9h 24m 32s

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