[build-script] Allow new Xcode 12.5 official release version

Author: LucianoPAlmeida

utils/build-script

@@ -58,7 +58,8 @@ _SUPPORTED_XCODE_BUILDS = [
     ("12.2", "12B45b"),
     ("12.3", "12C33"),
     ("12.4", "12D4e"),
-    ("12.5 beta 3", "12E5244e")
+    ("12.5 beta 3", "12E5244e"),
+    ("12.5", "12E262")
 ]
 
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