Automated update to Github CI to rustc nightly-2025-09-12

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit e487b07e172f · 2025-09-13T01:51:13.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-03-21
+nightly-2025-09-12
