Automated update to Github CI to rustc nightly-2026-01-31

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit 9b9a6fc128d1 · 2026-02-02T00:50:07.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-09-27
+nightly-2026-01-31
