replace ref_thread_local::ref_thread_local! with std::thread_local!

removes `ref_thread_local` which was still at 0.0.0 released October 2018 while latest 0.1.1 was released mid November 2021

fixes libraries.rs UB

src/machine/lib_machine.rs

@@ -238,7 +238,7 @@ mod tests {
     use crate::machine::{QueryMatch, QueryResolution, Value};
 
     #[test]
-    #[cfg_attr(miri, ignore = "blocked on libraries.rs UB")]
+    #[cfg_attr(miri, ignore = "it takes too long to run")]
     fn programatic_query() {
         let mut machine = Machine::new_lib();