Fix RELEASE build

  error: 'char* strncpy(char*, const char*, size_t)' accessing 0 or more bytes at offsets [0, 2147483647] and [0, 2147483647] may overlap up to 4294967295 bytes at offset [6442450941, 2147483647] [-Werror=restrict]
  strncpy(writeTo, buffer + index + count,len - index);

Author: pennam

arduino/cores/esp32/WString.cpp

@@ -638,7 +638,7 @@ void String::remove(unsigned int index, unsigned int count){
 	if (count > len - index) { count = len - index; }
 	char *writeTo = buffer + index;
 	len = len - count;
-	strncpy(writeTo, buffer + index + count,len - index);
+	memmove(writeTo, buffer + index + count, len - index);
 	buffer[len] = 0;
 }