{AKS} Fix live test pipeline (#9347)

Author: FumingZhang

src/aks-preview/azcli_aks_live_test/scripts/setup_venv.sh

@@ -32,7 +32,7 @@ setupAZ(){
     ext_repo=${2:-""}
 
     # install azdev, used later to install azcli and extension
-    pip install azdev==0.1.60
+    pip install azdev==0.2.8
 
     # fix setuptools to 77.0.3 as a workaround for "No module named azure.cli.__main__; 'azure.cli' is a package and cannot be directly executed"
     pip install setuptools==77.0.3