Fix regex in parse_coauthors method to correctly capture co-author names

Author: andrew

lib/git/pkgs/commands/blame.rb

@@ -101,7 +101,7 @@ def best_author(commit)
         def parse_coauthors(message)
           return [] unless message
 
-          message.scan(/^Co-authored-by:\s*([^<]+)<[^>]+>/i).flatten.map(&:strip)
+          message.scan(/^Co-authored-by:([^<]+)<[^>]+>/i).flatten.map(&:strip)
         end
 
         def bot_author?(name)