cmake: Download clang format 15

CMakeLists.txt

@@ -514,7 +514,7 @@ endif()
 # against all the src files. This should be used before making a pull request.
 # =======================================================================
 
-set(CLANG_FORMAT_POSTFIX "-12")
+set(CLANG_FORMAT_POSTFIX "-15")
 find_program(CLANG_FORMAT
     NAMES clang-format${CLANG_FORMAT_POSTFIX}
           clang-format