Apply formatting changes due to new black version

Author: Robert Schindler

exceptiongroup/_tools.py

@@ -7,7 +7,7 @@
 
 
 def split(exc_type, exc, *, match=None):
-    """ splits the exception into one half (matched) representing all the parts of
+    """splits the exception into one half (matched) representing all the parts of
     the exception that match the predicate, and another half (not matched)
     representing all the parts that don't match.