Update CMake compatibility

Using a recent CMake version (like 3.31.5) shows this warning.

```
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
Compatibility with CMake < 3.10 will be removed from a future version of
CMake.

Update the VERSION argument value. Or, use the ... syntax
to tell CMake that the project requires at least but has been updated
to work with policies introduced by or earlier.
```

I haven't tried it myself, but I know from dealing with other Gentoo Linux packaging issues that this is a fatal error with the new CMake 4, which Gentoo is now trialling. I recommend using the range syntax as it suggests.