build: bump CMake requirement to 3.25

Bump the required CMake version to 3.25 as we are using the `LINUX` variable
which was introduced in 3.25. This ensures that we build properly on Linux by
preventing use of an older CMake where certain sources and checks may be
otherwise elided.

Author: compnerd

CMakeLists.txt

@@ -8,7 +8,7 @@
 ## PATENTS file in the same directory.
 ##
 
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.25)
 cmake_policy(SET CMP0054 NEW)
 
 project(DebugServer2