IWYU: Update for Debian 13 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 13.  Some patterns:

* Types named in virtual `override` signatures no longer require
  includes since the overridden signature already names them.

* A function argument's type needs to be included even if its constructor
  is called only by implicit conversion.  For example, constructing a
  `std::function` from a lambda now requires `<functional>`.

* Some prior mysterious `<type_traits>` inclusions are no longer required.

Source/cmDependsJava.cxx

@@ -2,6 +2,8 @@
    file LICENSE.rst or https://cmake.org/licensing for details.  */
 #include "cmDependsJava.h"
 
+#include <set>
+
 #include "cmSystemTools.h"
 
 cmDependsJava::cmDependsJava() = default;