fix(occara): pass correct c++ std version for the include_cpp macro

While the code was compiled with the correct c++ version, the
'autocxx::include_cpp' macro still ran with c++14.
This fixes building on windows.

crates/occara/build.rs

@@ -35,6 +35,7 @@ fn main() -> miette::Result<()> {
         "src/ffi.rs",
         [&std::path::PathBuf::from("include"), &include_dir],
     )
+    .extra_clang_args(&["-std=c++20"])
     .build()?;
 
     autocxx_build