Fixed
- fixed metashacl with rdflib >= 6.2.0 by updating dependency pyshacl to 0.20.0
- fixed retrieval of plugin information if `Plugin.plugins` is empty or the plugin is not index 0
Changed
- dropped support for cmem-plugin-base < 2
- update dependency rdflib to 6.2.0
- using `UserContext` based function `setup_cmempy_user_access` instead of `setup_cmempy_super_user_access`