v3.13.15
gh-114099 - Add iOS testbed, plus Makefile target to invoke it. (gh-115930)
[3.13] gh-137973: Add a non-parallel test plan to the iOS testbed project (GH-138018) (#138039)
[3.13] gh-153631: Ensure iOS simulator is running before starting build (GH-153632) (#153675)