CMake: Bump maximum policy version to 3.27.

There are several new policies. CMP0149 may affect the Windows SDK
version that CMake will choose by default. The new behavior is more
predictable, always choosing the latest SDK version by default.

The other new policies shouldn't affect this package.

(cherry picked from commit 5be6275f19784cdd5a954f0188045c8ff4934d54)

CMakeLists.txt

@@ -46,7 +46,7 @@
 #
 #############################################################################
 
-cmake_minimum_required(VERSION 3.13...3.25 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.13...3.27 FATAL_ERROR)
 
 include(CheckSymbolExists)
 include(CheckStructHasMember)