Automated update to Github CI to rustc nightly-2026-01-09

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit 59916c173d5d · 2026-01-10T02:19:39.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-09-12
+nightly-2026-01-09
