Automated update to Github CI to rustc nightly-2025-10-18

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit ac7ab5f41a21 · 2025-10-20T00:38:30.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-09-27
+nightly-2025-10-18
