Update securityinsights readme.python (#19903)

* update securityinsights readme.python

* Update readme.python.md

Co-authored-by: Zhenbiao Wei (WICRESOFT NORTH AMERICA LTD) <[email protected]>

Author: Wzb123456789

specification/securityinsights/resource-manager/readme.python.md

@@ -11,6 +11,8 @@ namespace: azure.mgmt.securityinsight
 package-name: azure-mgmt-securityinsight
 package-version: 1.0.0b1
 clear-output-folder: true
+modelerfour:
+  lenient-model-deduplication: true
 ```
 
 ``` yaml $(python)