Proposal : Update Anime Chokin Senshi Cashman source

Proposal details

This proposal will make the following change(s):

Update the source of the anime Chokin Senshi Cashman

Change the source from Unknown to Manga

Based on the following reason: Missing

With the source: https://myanimelist.net/anime/6484/Chokin_Senshi_Cashman?q=Chokin%20Senshi%20Cashman&cat=anime