message: refactor(client): remove dead exec function
diff: @@ -439,11 +439,6 @@ impl Builder {
  }
  }
  - pub(super) fn exec(&mut self, exec: Exec) -> &mut Builder {
  - self.exec = exec;
  - self
  - }
  -
  /// Provide an executor to execute background HTTP2 tasks.
  pub fn executor<E>(&mut self, exec: E) -> &mut Builder
  where
  