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

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit 3753cc52b51e · 2025-12-13T02:06:40.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-09-12
+nightly-2025-12-12
