Tests: Update ClangPlugins to use C++23 when running Clang

Tests/ClangPlugins/CMakeLists.txt

@@ -4,7 +4,7 @@ include(AddLLVM)
 find_package(Python3 REQUIRED COMPONENTS Interpreter)
 
 get_property(CLANG_PLUGINS_ALL_COMPILE_OPTIONS GLOBAL PROPERTY CLANG_PLUGINS_ALL_COMPILE_OPTIONS)
-list(APPEND CLANG_PLUGINS_ALL_COMPILE_OPTIONS -std=c++20 -Wno-user-defined-literals -Wno-literal-range)
+list(APPEND CLANG_PLUGINS_ALL_COMPILE_OPTIONS -std=c++23 -Wno-user-defined-literals -Wno-literal-range)
 
 get_property(CLANG_PLUGINS_INCLUDE_DIRECTORIES TARGET AK PROPERTY INCLUDE_DIRECTORIES)
 list(APPEND CLANG_PLUGINS_INCLUDE_DIRECTORIES ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})