updated protobuf to 3.18.1

external/include/google/protobuf/io/tokenizer.h

@@ -217,8 +217,8 @@ class PROTOBUF_EXPORT Tokenizer {
   // result.  If the text is not from a Token of type TYPE_INTEGER originally
   // parsed by a Tokenizer, the result is undefined (possibly an assert
   // failure).
-  static bool ParseInteger(const std::string& text, uint64 max_value,
-                           uint64* output);
+  static bool ParseInteger(const std::string& text, uint64_t max_value,
+                           uint64_t* output);
 
   // Options ---------------------------------------------------------