update history

Author: FumingZhang

src/aks-preview/HISTORY.rst

@@ -12,6 +12,7 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 * Vendor new SDK and bump API version to 2025-08-02-preview.
+* Pre-deprecate `--enable-custom-ca-trust` and `--disable-custom-ca-trust` in `az aks create`, `az aks update` commands.
 
 18.0.0b43
 +++++++