Update machine-learning-models.mdx (#22033)

Updated for MLv9

Author: amartinetticf

src/content/docs/bots/reference/machine-learning-models.mdx

@@ -33,4 +33,5 @@ By not updating to the latest version, you will be using a Machine Learning mode
 | v5      | Recalibrated model for the [removal of `_cfduid` cookie](https://blog.cloudflare.com/deprecating-cfduid-cookie/). <br/><br/> Introduced new signals to reduce false negatives.                                                              | Q2 2021     |
 | v6      | Significantly improved scoring for native Android application traffic. <br/><br/>Improved scoring on the newest versions of Chromium browsers.                                                                                              | Q1 2022     |
 | v7      | Increased recognition of distributed botnets. <br/><br/>Improved HTTP/3 scoring.                                                                                                                                                            | Q1 2024     |
-| v8      | Improved detection of residential proxies. <br/><br/>Increased weight on network level traffic characteristics.                                                                                                                             | Q2 2024     |
+| v8      | Improved detection of residential proxies. <br/><br/>Increased weight on network level traffic characteristics.                                                                                                                             | Q2 2024     |
+| v9      | Improved model consistency and model efficacy against randomization attack techniques | Q2 2025     |