Update py sdk version to b04 (#19576)

Co-authored-by: kipartha <[email protected]>

Author: belthurkiran

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

@@ -8,7 +8,7 @@ azure-arm: true
 license-header: MICROSOFT_MIT_NO_VERSION
 package-name: azure-mgmt-chaos
 namespace: azure.mgmt.chaos
-package-version: 1.0.0b3
+package-version: 1.0.0b4
 clear-output-folder: true
 ```