Update regex to extract the author string, and create the Actor using the _from_string classmethod.

Author: itsluketwist

git/objects/commit.py

@@ -752,11 +752,11 @@ def co_authors(self) -> List[Actor]:
 
         if self.message:
             results = re.findall(
-                r"^Co-authored-by: ((?:\w|\-| ){0,38}) <(\S*)>$",
+                r"^Co-authored-by: ((?:\w|\-| ){0,38} <\S*>)$",
                 self.message,
                 re.MULTILINE,
             )
-            for author in results:
-                co_authors.append(Actor(*author))
+            for author_string in results:
+                co_authors.append(Actor._from_string(author_string))
 
         return co_authors