chore: update SHA from #1497 (#2050)

Comparing https://leanprover-community.github.io/mathlib-port-status/file/algebra/free_monoid/basic against #1497 shows that this is already up to date.
leanprover-community · Mar 19, 2023 · 70ff72b · 70ff72b
1 parent d8b38e1
commit 70ff72b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/Mathlib/Algebra/FreeMonoid/Basic.lean b/Mathlib/Algebra/FreeMonoid/Basic.lean
@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Simon Hudon, Yury Kudryashov
 
 ! This file was ported from Lean 3 source module algebra.free_monoid.basic
-! leanprover-community/mathlib commit dd71334db81d0bd444af1ee339a29298bef40734
+! leanprover-community/mathlib commit 657df4339ae6ceada048c8a2980fb10e393143ec
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/