Update pydocstyle to ignore D213
Update pydocstyle to ignore D213

With the new version of pydocstyle (1.1.1) both D213 and D212 were enabled
leading to multiple warnings as they are mutually exclusive. The commit makes
pydocstyle use D212 and not D213.

karlch/vimiv,karlch/vimiv,karlch/vimiv