Removing minor version from device_os value. (#104727)

Author: yusuf-goog

.ci.yaml

@@ -86,7 +86,7 @@ platform_properties:
         ]
       os: Mac-12
       cpu: x86
-      device_os: iOS-15.1
+      device_os: iOS-15
       xcode: 13a233
   mac_arm64_ios:
     properties:
@@ -98,7 +98,7 @@ platform_properties:
         ]
       os: Mac-12
       cpu: arm64
-      device_os: iOS-15.1
+      device_os: iOS-15
       xcode: 13a233
   windows:
     properties: