message: Remove superfluous clippy exception
diff: @@ -60,7 +60,6 @@ impl EraId {
  /// For `u64::MAX`, this returns `u64::MAX` again: We want to make sure this doesn't panic, and
  /// that era number will never be reached in practice.
  #[must_use]
  - #[allow(clippy::integer_arithmetic)] // The caller must make sure this doesn't overflow.
  pub fn successor(self) -> EraId {
  EraId::from(self.0.saturating_add(1))
  }
  