add griffe dependency

[chrisdicaprio]

griffe is used to create dynamic docstrings (solvis.dochelper.extension)

chrisdc@hutl24256:~/.../LIB/solvis (68-pytz)$ poetry run pytest -x                                                                                                                                         [9/1886]
/home/chrisdc/.cache/pypoetry/virtualenvs/solvis-qpVvtzRQ-py3.10/lib/python3.10/site-packages/_pytest/config/__init__.py:318: PluggyTeardownRaisedWarning: A plugin raised an exception during an old-style hookwra
pper teardown.                                                                                                                                                                                                     
Plugin: helpconfig, Hook: pytest_cmdline_parse                                                                                                                                                                     
ConftestImportFailure: ModuleNotFoundError: No module named 'griffe' (from /home/chrisdc/NSHM/DEV/LIB/solvis/test/conftest.py)                                                                                     
For more information see https://pluggy.readthedocs.io/en/stable/api_reference.html#pluggy.PluggyTeardownRaisedWarning                                                                                             
  config = pluginmanager.hook.pytest_cmdline_parse(                                                                                                                                                                
ImportError while loading conftest '/home/chrisdc/NSHM/DEV/LIB/solvis/test/conftest.py'.                                                                                                                           
test/conftest.py:12: in <module>                                                                                                                                                                                   
    from solvis import FaultSystemSolution                                                                                                                                                                         
solvis/__init__.py:26: in <module>
    from .solution import CompositeSolution, FaultSystemSolution, InversionSolution
solvis/solution/__init__.py:26: in <module>
    from .composite_solution import CompositeSolution
solvis/solution/composite_solution.py:17: in <module>
    from solvis.solution.inversion_solution.inversion_solution_file import data_to_zip_direct
solvis/solution/inversion_solution/__init__.py:11: in <module>
    from .inversion_solution import BranchInversionSolution, InversionSolution
solvis/solution/inversion_solution/inversion_solution.py:27: in <module>
    from solvis.dochelper import inherit_docstrings
solvis/dochelper/__init__.py:3: in <module>
    from .extension import DynamicDocstrings
solvis/dochelper/extension.py:10: in <module>
    import griffe
E   ModuleNotFoundError: No module named 'griffe'
chrisdc@hutl24256:~/.../LIB/solvis (68-pytz)$ poetry show griffe
 name         : griffe                                                                                                                                                                      
 version      : 1.5.6                                                                                                                                                                       
 description  : Signatures for entire Python programs. Extract the structure, the frame, the skeleton of your project, to generate API documentation or find breaking changes in your API. 

dependencies
 - colorama >=0.4

required by
 - mkdocstrings-python >=0.49
chrisdc@hutl24256:~/.../LIB/solvis (68-pytz)$ poetry show mkdocstrings-python
 name         : mkdocstrings-python                
 version      : 1.13.0                             
 description  : A Python handler for mkdocstrings. 

dependencies
 - griffe >=0.49
 - mkdocs-autorefs >=1.2
 - mkdocstrings >=0.26

required by
 - mkdocstrings >=0.5.2