Updated bindgen version to fix build bug

Author: SilasMarvin

lightgbm-sys/Cargo.toml

@@ -16,5 +16,5 @@ cuda = []
 libc = "0.2.81"
 
 [build-dependencies]
-bindgen = "0.56.0"
+bindgen = "0.68"
 cmake = "0.1"

src/booster.rs

@@ -178,7 +178,7 @@ impl Booster {
  self.handle,
  feature_name_length as i32,
  &mut num_feature_names,
- num_feature as u64,
+ num_feature as usize,
  &mut out_buffer_len,
  out_strs.as_ptr() as *mut *mut c_char
  ))?;