Fix bridge-cast error. (#24801)

kSecAttrKeyTypeECSECPrimeRandom is a CFStringRef, not a number.

Author: itf

src/darwin/CHIPTool/CHIPTool/Framework Helpers/FabricKeys.m

@@ -110,7 +110,7 @@ + (NSDictionary *)privateKeyCreationParams
 
     return @{
         (__bridge NSString *) kSecAttrKeyClass : (__bridge NSString *) kSecAttrKeyClassPrivate,
-        (__bridge NSString *) kSecAttrKeyType : (__bridge NSNumber *) kSecAttrKeyTypeECSECPrimeRandom,
+        (__bridge NSString *) kSecAttrKeyType : (__bridge NSString *) kSecAttrKeyTypeECSECPrimeRandom,
         (__bridge NSString *) kSecAttrKeySizeInBits : @(keySizeInBits),
         (__bridge NSString *) kSecAttrIsPermanent : @(NO)
     };