Update sdk-suppressions.yaml

Author: msyyc

specification/cdn/resource-manager/sdk-suppressions.yaml

@@ -143,3 +143,4 @@ suppressions:
         - Deleted or renamed model `UrlRedirectActionParametersTypeName`
         - Deleted or renamed model `UrlRewriteActionParametersTypeName`
         - Deleted or renamed model `UrlSigningActionParametersTypeName`
+        - Method `UrlSigningKeyParameters.__init__` removed default value `None` from its parameter `secret_version`