ci: disable visionos.yml by renaming the file

.github/workflows/visionos.yml → .github/workflows/visionos.yml.disabled

@@ -1,8 +1,7 @@
 name: Build (visionOS)
 
-# FIXME: CMake 3.28 is not yet available on the github runner
-# on: [push, pull_request]
-on: workflow_dispatch:  # FIXME: remove this event once cmake 3.28 is released
+# FIXME: Enable this workflow once CMake 3.28 becomes available on GitHub
+on: [push, pull_request]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}