Upgrade to libvips v8.18.0-rc2 (#308) #147

Job	Run time
check-latest-versions	32s
build-win32-x64	4m 50s
build-linux-ppc64le	14m 29s
build-win32-ia32	20s
build-dev-wasm32	17m 25s
build-linux-riscv64	16m 58s
build-darwin-arm64v8	24m 2s
build-win32-arm64v8	18s
build-linuxmusl-x64	24m 39s
build-darwin-x64	26m 13s
build-linux-armv6	15m 23s
build-linuxmusl-arm64v8	17m 41s
build-linux-x64	14m 4s
build-linux-arm64v8	12m 4s
build-linux-s390x	14m 5s
populate-and-publish-npm-workspace	1m 45s
	3h 24m 48s

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