chore: bump toolchain to v4.29.0-rc6 (#1708)

Co-authored-by: François G. Dorais <fgdorais@gmail.com>

Author: kim-em

Batteries/Data/Bool.lean

@@ -16,13 +16,15 @@ WellFoundedGT classes available in Mathlib.
 -/
 
 /-- Boolean '<' is well founded -/
+@[implicit_reducible]
 def Bool.lt_wfRel : WellFoundedRelation Bool where
   rel := (· < ·)
   wf := ⟨fun
     | false => ⟨false, nofun⟩
     | true => ⟨true, fun | false, _ => ⟨false, nofun⟩⟩⟩
 
 /-- Boolean '>' is well founded -/
+@[implicit_reducible]
 def Bool.gt_wfRel : WellFoundedRelation Bool where
   rel := (· > ·)
   wf := ⟨fun

lean-toolchain

@@ -1 +1 @@
-leanprover/lean4:v4.29.0-rc4
+leanprover/lean4:v4.29.0-rc6