Update lean-toolchain for testing leanprover/lean4#10880

leanprover-community-mathlib4-bot · leanprover-community-mathlib4-bot · commit c722b5e7c7dc · 2025-10-21T23:31:02.000Z
diff --git a/lean-toolchain b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2025-10-21
+leanprover/lean4-pr-releases:pr-release-10880-8f42ac6

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-leanprover/lean4:nightly-2025-10-21`
	`1`	`+leanprover/lean4-pr-releases:pr-release-10880-8f42ac6`