Update lean-toolchain for testing leanprover/lean4#10826

leanprover-community-mathlib4-bot · leanprover-community-mathlib4-bot · commit 1a742f5c3813 · 2025-10-21T11:14:29.000Z
diff --git a/lean-toolchain b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2025-10-20
+leanprover/lean4-pr-releases:pr-release-10826-f5b8e42

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-leanprover/lean4:nightly-2025-10-20`
	`1`	`+leanprover/lean4-pr-releases:pr-release-10826-f5b8e42`