key_manager.find_secret() fails with unexpected keyword argument 'microversion'

[Markus Hentsch]

The following sample code snippet fails with openstacksdk 3.1.0:

```
import openstack
conn = openstack.connect(cloud="my-devstack")
conn.key_manager.find_secret("my-secret-name")
```

Error message:

```
    ...
    return match.fetch(session, microversion=microversion, **params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Secret.fetch() got an unexpected keyword argument 'microversion'
```

Seems like the fetch() implementation for the Secret resource class[^1] is missing a `**params` kwargs argument in contrast to its base class[^2].

[^1]: https://github.com/openstack/openstacksdk/blob/0d5d48f65f3eae30f940504d319ea3515608a238/openstack/key_manager/v1/secret.py#L87-L94

[^2]: https://github.com/openstack/openstacksdk/blob/0d5d48f65f3eae30f940504d319ea3515608a238/openstack/resource.py#L1652-L1663