Correct iOS CI invocation.

Author: freakboy3742

.github/workflows/build-release.yml

@@ -297,7 +297,7 @@ jobs:
           ref: "v${{ env.CPYTHON_RELEASE }}"
 
       - name: Build and test
-        run: python3 Platforms/Apple build ci --slow-ci
+        run: python3 Platforms/Apple ci iOS --slow-ci
 
       - uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with: