Automated update to Github CI to rustc nightly-2026-04-03

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit 30e9a374f520 · 2026-04-04T02:52:09.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2026-03-20
+nightly-2026-04-03
