Remove unnecessary dependencies in buffer and language crates

crates/buffer/src/point.rs

@@ -109,21 +109,3 @@ impl Ord for Point {
         }
     }
 }
-
-impl Into<tree_sitter::Point> for Point {
-    fn into(self) -> tree_sitter::Point {
-        tree_sitter::Point {
-            row: self.row as usize,
-            column: self.column as usize,
-        }
-    }
-}
-
-impl From<tree_sitter::Point> for Point {
-    fn from(point: tree_sitter::Point) -> Self {
-        Self {
-            row: point.row as u32,
-            column: point.column as u32,
-        }
-    }
-}