Disable rustup upgrades

Author: buggmagnet

.github/workflows/ios.yml

@@ -90,9 +90,9 @@ jobs:
         # The workaround is to asking brew to reinstall rustup
         run: |
           brew install rustup
-          rustup default stable
-          rustup update stable
-          rustup target add aarch64-apple-ios-sim
+        # rustup default stable
+        # rustup update stable
+        # rustup target add aarch64-apple-ios-sim
 
       - name: Configure Xcode project
         run: |