chore: update Mathlib dependencies 2026-05-29 (leanprover-community#40021)

This PR updates the Mathlib dependencies.

Author: mathlib-update-dependencies[bot]

.github/actions/get-mathlib-ci/action.yml

@@ -10,7 +10,7 @@ inputs:
     # Default pinned commit used by workflows unless they explicitly override.
     # Update this ref as needed to pick up changes to mathlib-ci scripts
     # This is also updated automatically by .github/workflows/update_dependencies.yml
-    default: aafe3df227b81f681afa3978f9eab0e2bbcd0582
+    default: 99cb894ced94b5f7cf27e3b42108c0bee1218f12
   path:
     description: Checkout destination path.
     required: false