chore: adaptations for nightly-2026-05-13 (#222)

mathlib-nightly-testing[bot] · kim-em · mathlib4-bot · mathlib-nightly-testing[bot] · commit 1f8d390e49d8 · 2026-05-14T07:37:37.000Z
Co-authored-by: Kim Morrison &lt;kim@tqft.net&gt;
Co-authored-by: mathlib4-bot &lt;github-mathlib4-bot@leanprover.zulipchat.com&gt;
Co-authored-by: Kim Morrison &lt;477956+kim-em@users.noreply.github.com&gt;
diff --git a/lean-toolchain b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2026-05-12
+leanprover/lean4:nightly-2026-05-13

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-leanprover/lean4:nightly-2026-05-12`
	`1`	`+leanprover/lean4:nightly-2026-05-13`