action: Fix dereference of team name

Instead of returning the team object, return the team name.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

Author: carlescufi

action.py

@@ -59,7 +59,7 @@ def filter_reviewers(org, pr, reviewers, team_reviewers):
             if m.login in reviews:
                 break
         else:
-            t.append(team)
+            t.append(team.name)
 
     return r, t