CI: autofix rust code.

src/parser/drawer.rs

@@ -99,7 +99,7 @@ fn name<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, OrgSource<'s>> {
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 fn drawer_end<'r, 's>(
-    context: Context<'r, 's>,
+    _context: Context<'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     start_of_line(input)?;