Automated update to Github CI to rustc nightly-2026-03-20

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit deaadb167f4b · 2026-03-21T02:43:58.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2026-02-20
+nightly-2026-03-20
