feat: added swift 6.4.0 support

Author: mach-port-t

Makefile

@@ -4,7 +4,7 @@ OS_VER ?= 16.0
 LLVM_ARCH := AArch64
 APPLE_ARCH := arm64
 TARGET_TRIPLE := $(APPLE_ARCH)-apple-ios$(OS_VER)
-SWIFT_BRANCH ?= swift-6.3.3-RELEASE
+SWIFT_BRANCH ?= swift-6.4.0-RELEASE
 SWIFT_SOURCE_DIR ?= swift
 SWIFT_TOOLCHAIN_ZIP := SwiftToolchain.zip
 SWIFT_TOOLCHAIN_ROOT ?= SwiftToolchain-iphoneos