@Abhishek Jadhav Thanks for reaching out.
To answer your question "then I need to create new api versioning of my all other apis which was created in azure api management service before 2021-08-01 with latest revision"
No, you don't have to create a new version of your APIs in your APIM instance.
Azure API Management uses Azure Resource Manager (ARM) to configure your API Management instances. The API version is embedded in your use of templates that describe your infrastructure, tools that are used to configure the service, and programs that you write to manage your Azure API Management services.
So, this is the APIM's endpoint that will have a specific version in the URL that you are calling from Azure CLI, Azure PowerShell, Azure API Management DevOps Resource Kit, or Terraform) to interact with the API Management service endpoint and not to your API's that you create in your APIM instance.
For more details you can refer to this.
Hope the above clears things up and let me know if you have any queries or concerns.
Please click on 'Yes' if it helped so that it can help others in the community looking for help on similar topics.