Update lean-toolchain for testing leanprover/lean4#13302

Author: leanprover-community-mathlib4-bot

lake-manifest.json

@@ -65,10 +65,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "bbce955199ecd027a4706410de098bdd2804f9a9",
+   "rev": "519295c67f81f42004dc3dc8b42404231a3e0a15",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "nightly-testing",
+   "inputRev": "lean-pr-testing-13302",
    "inherited": false,
    "configFile": "lakefile.toml"},
   {"url": "https://github.com/leanprover/lean4-cli",

lakefile.lean

@@ -6,7 +6,7 @@ open Lake DSL
 ## Mathlib dependencies on upstream projects
 -/
 
-require "leanprover-community" / "batteries" @ git "nightly-testing"
+require "leanprover-community" / "batteries" @ git "lean-pr-testing-13302"
 require "leanprover-community" / "Qq" @ git "nightly-testing"
 require "leanprover-community" / "aesop" @ git "nightly-testing"
 require "leanprover-community" / "proofwidgets" @ git "nightly-testing"

lean-toolchain

@@ -1 +1 @@
-leanprover/lean4:nightly-2026-04-01
+leanprover/lean4-pr-releases:pr-release-13302-b8cb743