Mark Xcode 13.2 beta as supported in build-script. (#40021)

Author: stephentyrone

utils/build-script

@@ -58,7 +58,8 @@ _SUPPORTED_XCODE_BUILDS = [
     ("13.0 beta", "13A5154h"),
     ("13.0 beta 4", "13A5201i"),
     ("13.0", "13A233"),
-    ("13.1 RC 1", "13A1030d")
+    ("13.1 RC 1", "13A1030d"),
+    ("13.2 beta", "13C5066c")
 ]
 
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