Upgrade to libvips v8.18.0-rc.2 #1655

Job	Run time
lint	28s
build-linuxmusl-arm64 [Node.js 18] [package]	1m 24s
build-wasm32 [package]	3m 19s
build-linux-riscv64 [Node.js 20] [package]	7m 13s
build-linux-s390x [Node.js 18] [package]	7m 17s
build-linux-ppc64 [Node.js 18] [package]	6m 43s
build-linuxmusl-arm64 [Node.js 20]	1m 17s
build-linux-x64 [Node.js 22]	2m 11s
build-linuxmusl-x64 [Node.js 20]	1m 25s
build-linux-arm64 [Node.js 18] [package]	1m 49s
build-darwin-x64 [Node.js 20]	2m 44s
build-win32-arm64 [Node.js 20] [package]	4m 21s
build-darwin-arm64 [Node.js 18] [package]	1m 26s
build-linux-arm64 [Node.js 20]	1m 44s
build-win32-x64 [Node.js 20]	2m 22s
build-linux-arm [Node.js 18] [package]	6m 38s
build-linux-x64 [Node.js 18] [package]	1m 51s
build-darwin-x64 [Node.js 18] [package]	2m 8s
build-darwin-arm64 [Node.js 22]	1m 34s
build-win32-ia32 [Node.js 20]	2m 51s
build-linuxmusl-x64 [Node.js 22]	1m 24s
build-linuxmusl-x64 [Node.js 18] [package]	1m 31s
build-win32-x64 [Node.js 22]	2m 50s
build-darwin-x64 [Node.js 22]	3m 19s
build-win32-x64 [Node.js 18] [package]	2m 30s
build-win32-arm64 [Node.js 22]	4m 23s
build-darwin-arm64 [Node.js 20]	1m 38s
build-linux-x64 [Node.js 20]	2m 2s
build-win32-ia32 [Node.js 18] [package]	2m 55s
build-win32-ia32 [Node.js 22]	2m 46s
release	37s
	1h 26m 40s

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