update sprintf to snprintf

include/doctest/doctest.h

@@ -4151,7 +4151,7 @@ namespace doctest
 #define DOCTEST_TO_STRING_OVERLOAD(type, fmt)                                                      \
   String toString(type in) {                                                                     \
     char buf[64];                                                                              \
-    std::sprintf(buf, fmt, in);                                                                \
+    std::snprintf(buf, sizeof( buf ), fmt, in);                                                                \
     return buf;                                                                                \
   }