IWYU: Update for Debian 12 CI job

`include-what-you-use` diagnostics, in practice, are specific to
the environment's compiler and standard library.  Update includes
to satisfy IWYU for our CI job under Debian 12.

Source/LexerParser/cmExprParser.y

@@ -13,7 +13,6 @@ Run bison like this:
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
-#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdexcept>