chore: adaptations for Aesop import reduction (leanprover-community#40217)

This PR adds an import, so that mathlib can adapt to the changes in leanprover-community/aesop#330.

Bumping the aesop version to that PR improves mathlib's instructions by 0.15%: this is for a future PR.

Author: JovanGerb

Mathlib/Tactic/Order/ToInt.lean

@@ -10,6 +10,7 @@ public import Batteries.Tactic.GeneralizeProofs
 public import Mathlib.Tactic.Order.CollectFacts
 public meta import Mathlib.Util.AtomM
 public meta import Mathlib.Util.Qq
+public meta import Std.Data.HashMap.AdditionalOperations
 
 /-!
 # Translating linear orders to ℤ