build: use macOS 14 SDK (Xcode 15.0)

ci/test/00_setup_env_mac.sh

@@ -12,8 +12,8 @@ export CONTAINER_NAME=ci_macos_cross
 export CI_IMAGE_NAME_TAG="docker.io/ubuntu:22.04"
 export HOST=x86_64-apple-darwin
 export PACKAGES="cmake zip"
-export XCODE_VERSION=12.2
-export XCODE_BUILD_ID=12B45b
+export XCODE_VERSION=15.0
+export XCODE_BUILD_ID=15A240d
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export GOAL="deploy"