Update utils/build-script

Co-authored-by: Ben Rimmington <me@benrimmington.com>

Author: shahmishal

utils/build-script

@@ -58,6 +58,7 @@ HOME = os.environ.get("HOME", "/")
 _SUPPORTED_XCODE_BUILDS = [
     ("12.2 beta 3", "12B5035g"),
     ("12.2 Release Candidate", "12B5044c"),
+    ("12.2", "12B45b"),
 ]
 
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