az storage account show-connection-string does not work

### **This is autogenerated. Please review and update as needed.**

## Describe the bug

**Command Name**
`az storage account show-connection-string`

**Errors:**
```
APIVersion 2021-01-01 is not available
Traceback (most recent call last):
python3.6/site-packages/knack/cli.py, ln 233, in invoke
cmd_result = self.invocation.execute(args)
cli/core/commands/__init__.py, ln 660, in execute
raise ex
cli/core/commands/__init__.py, ln 723, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
cli/core/commands/__init__.py, ln 716, in _run_job
six.reraise(*sys.exc_info())
...
cli/command_modules/storage/_client_factory.py, ln 143, in cf_sa
return storage_client_factory(cli_ctx).storage_accounts
azure/mgmt/storage/_storage_management_client.py, ln 413, in storage_accounts
raise NotImplementedError("APIVersion {} is not available".format(api_version))
NotImplementedError: APIVersion 2021-01-01 is not available
```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az storage account show-connection-string -g {} -n {}`

## Expected Behavior

## Environment Summary
```
Linux-4.15.0-1108-azure-x86_64-with-debian-stretch-sid
Python 3.6.9
Installer: PIP

azure-cli 2.20.0 *
azure-cli-ml 1.24.0

Extensions:
azure-cli-ml 1.24.0

```
## Additional Context