Update lean-toolchain for testing leanprover/lean4#8753

leanprover-community-mathlib4-bot · leanprover-community-mathlib4-bot · commit d140bb81c259 · 2025-06-13T00:05:14.000Z
diff --git a/lean-toolchain b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2025-06-12
+leanprover/lean4-pr-releases:pr-release-8753-8ec35d8

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-leanprover/lean4:nightly-2025-06-12`
	`1`	`+leanprover/lean4-pr-releases:pr-release-8753-8ec35d8`