Add String::concat(const uint8_t *, unsigned int) version

From upstream ArduinoCore-API commit eaab14db09073afc20bcf26bd9b7448a6a1309b0

Author: rcombs

cores/esp32/WString.h

@@ -110,6 +110,7 @@ class String {
         unsigned char concat(const String &str);
         unsigned char concat(const char *cstr);
         unsigned char concat(const char *cstr, unsigned int length);
+        unsigned char concat(const uint8_t *cstr, unsigned int length) {return concat((const char*)cstr, length);}
         unsigned char concat(char c);
         unsigned char concat(unsigned char c);
         unsigned char concat(int num);