ci: bump IPHONEOS_DEPLOYMENT_TARGET to 17.5 #5651

Job	Run time
docker	1m 37s
http3_test	46s
android_ndk_lts (aarch64-linux-android)	1m 26s
nginx (1.16.1)	1m 3s
android_ndk_lts (armv7-linux-androideabi)	58s
quiche	4m 38s
android_ndk_lts (x86_64-linux-android)	51s
quiche_ios (x86_64-apple-ios)	1m 11s
quiche (boringssl-boring-crate)	4m 8s
android_ndk_lts (i686-linux-android)	1m 2s
quiche_ios (aarch64-apple-ios)	1m 10s
quiche (openssl)	6m 50s
quiche_macos (macos-13)	3m 43s
quiche_macos (macos-latest)	1m 43s
quiche_multiarch (aarch64-unknown-linux-gnu)	1m 54s
quiche_windows (x86_64-pc-windows-msvc)	1m 41s
quiche_multiarch (armv7-unknown-linux-gnueabihf)	1m 40s
quiche_windows (i686-pc-windows-msvc)	2m 45s
quiche_multiarch (i686-unknown-linux-gnu)	1m 48s
quiche_windows (x86_64-pc-windows-gnu)	1m 58s
quiche_windows (i686-pc-windows-gnu)	2m 48s
	45m 40s

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