Suppres CC_MD5 warning (#47378)

Summary:
Pull Request resolved: #47378

The RCTMD5Hash in RCTUtils is using CC_MD5 function which is deprecated. unfortunately we can't really change it or we will break many apps that use it in the AsyncStorage.

Those app wlll have to do a migration to use a different function. Meanwhile we are suppressing the warning

## Changelog
[Internal] - Suppress CC_MD5 warning

Reviewed By: cortinico

Differential Revision: D65424309

fbshipit-source-id: e0258ae68482f6c4a3a865bb52920f87bc5ada21

Author: cipolleschi

packages/react-native/React/Base/RCTUtils.m

@@ -239,7 +239,10 @@ id RCTJSONClean(id object)
 {
   const char *str = string.UTF8String;
   unsigned char result[CC_MD5_DIGEST_LENGTH];
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
   CC_MD5(str, (CC_LONG)strlen(str), result);
+#pragma clang diagnostic pop
 
   return [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                                     result[0],