Bump version to 19.0.0b12 and move PSS changes to new version section

Author: ShantingLiu

src/aks-preview/HISTORY.rst

@@ -12,10 +12,13 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
+19.0.0b12
++++++++
+* `az aks safeguards`: Add support for Deployment Safeguards with Pod Security Standards (PSS). New `--pss-level` parameter allows setting PSS enforcement level to Privileged, Baseline, or Restricted. Commands now support both `-g/-n` and `--cluster` argument patterns.
+
 19.0.0b11
 +++++++
 * Remove PMK validation for `--azure-keyvault-kms-key-id` parameter.
-* `az aks safeguards`: Add support for Deployment Safeguards with Pod Security Standards (PSS). New `--pss-level` parameter allows setting PSS enforcement level to Privileged, Baseline, or Restricted. Commands now support both `-g/-n` and `--cluster` argument patterns.
 * `az aks update`: Set CMK property "enabled" to false and remove other CMK properties when enabling PMK on a CMK-disabled cluster
 
 19.0.0b10

src/aks-preview/setup.py

@@ -9,7 +9,7 @@
 
 from setuptools import find_packages, setup
 
-VERSION = "19.0.0b11"
+VERSION = "19.0.0b12"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",