add kwargs to _warnings.py (#3483)

## Changes proposed in this pull request
add kwargs to the fmriprep _warnings.py script to handle new version of
matplotlib warnings

closes #3478

Author: mgxd

.maint/CONTRIBUTORS.md

@@ -13,6 +13,7 @@ Before every release, unlisted contributors will be invited again to add their n
 | Bellec            | Pierre       |  | 0000-0002-9111-0699 | SIMEXP Lab, CRIUGM, University of Montréal, Montréal, Canada                                                                                 |
 | Benson            | Noah C.      |  | 0000-0002-2365-8265 | Department of Psychology, New York University                                                                                                |
 | Bhagwat           | Nikhil       |  | 0000-0001-6073-7141 | Montreal Neurological Institute, McGill University                                                                                           |
+| Camacho           | Milton       |  | 0000-0002-5379-5076 | Department of Pediadrics, University of Calgary                                                                                           |
 | Callenberg        | Keith        |  | 0000-0001-7786-9300 | Department of Psychiatry, University of Pittsburgh                                                                                           |
 | Cieslak           | Matthew      |  | 0000-0002-1931-4734 | Perelman School of Medicine, University of Pennsylvania, PA, USA                                                                             |
 | de la Vega        | Alejandro    |  | 0000-0001-9062-3778 | University of Texas at Austin                                                                                                                |

fmriprep/_warnings.py

@@ -29,17 +29,20 @@
 _wlog.addHandler(logging.NullHandler())
 
 
-def _warn(message, category=None, stacklevel=1, source=None):
+def _warn(message, category=None, stacklevel=1, source=None, **kwargs):
     """Redefine the warning function."""
     if category is not None:
         category = type(category).__name__
         category = category.replace('type', 'WARNING')
 
+    if kwargs:
+        logging.getLogger('py.warnings').warning(f'Extra warning kwargs: {kwargs}')
+
     logging.getLogger('py.warnings').warning(f'{category or "WARNING"}: {message}')
 
 
-def _showwarning(message, category, filename, lineno, file=None, line=None):
-    _warn(message, category=category)
+def _showwarning(message, category, filename, lineno, file=None, line=None, **kwargs):
+    _warn(message, category=category, **kwargs)
 
 
 warnings.warn = _warn