Update build.yml

Author: opficdev

.github/workflows/build.yml

@@ -34,6 +34,12 @@ jobs:
 
           mac_ver = subprocess.check_output(["sw_vers", "-productVersion"], text=True).strip()
           mac_major = mac_ver.split('.')[0]
+          try:
+            mac_major_num = int(mac_major)
+          except ValueError:
+            mac_major_num = None
+          if mac_major_num is not None and mac_major_num <= 15:
+            mac_major = "26"
 
           text = subprocess.check_output(["xcrun", "simctl", "list", "devices"], text=True)
           lines = text.splitlines()