[xcode15] Bump to Xcode 15 beta 4

Make.config

@@ -201,8 +201,8 @@ MACCATALYST_NUGET_VERSION_FULL=$(MACCATALYST_NUGET_VERSION_NO_METADATA)+$(NUGET_
 
 # Xcode version should have both a major and a minor version (even if the minor version is 0)
 XCODE_VERSION=15.0
-XCODE_URL=https://dl.internalx.com/internal-files/xcodes/Xcode_15_beta_3.xip
-XCODE_DEVELOPER_ROOT=/Applications/Xcode_15.0.0-beta3.app/Contents/Developer
+XCODE_URL=https://dl.internalx.com/internal-files/xcodes/Xcode_15_beta_4.xip
+XCODE_DEVELOPER_ROOT=/Applications/Xcode_15.0.0-beta4.app/Contents/Developer
 XCODE_PRODUCT_BUILD_VERSION:=$(shell /usr/libexec/PlistBuddy -c 'Print :ProductBuildVersion' $(XCODE_DEVELOPER_ROOT)/../version.plist 2>/dev/null || echo "    $(shell tput setaf 1 2>/dev/null)The required Xcode ($(XCODE_VERSION)) is not installed in $(basename $(basename $(XCODE_DEVELOPER_ROOT)))$(shell tput sgr0 2>/dev/null)" >&2)
 
 # We define stable Xcode as the Xcode app being named like "Xcode_#.#[.#].app"