add GPTBot to matcher for known bots (#89188)
### What?
Adds GPTBot to matcher for returning true if it is a known bot. An
example UserAgent string for this type of bot is "Mozilla/5.0
AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.3;
+https://openai.com/gptbot)"
### Why?
This is a known bot and so it should be treated as such
### How?
Self explanatory
Co-authored-by: davidgolden <david@soprisapps.com>
