Automated update to Github CI to rustc nightly-2025-07-18

Update Nightly Rustc Bot · Update Nightly Rustc Bot · commit 81d8e478e3e5 · 2025-07-19T02:20:36.000Z
diff --git a/nightly-version b/nightly-version
@@ -1 +1 @@
-nightly-2025-03-21
+nightly-2025-07-18
