update shiny_cat's_pact -> shiny_cats_pact

BUR #29441 has been rejected.

mass update shiny_cat's_pact -> shiny_cats_pact

Change to official name mistake for adding ('s)

This is a mass update, so it would just add the tag shiny cats pact to the posts that have shiny cat's pact. What you want to do here is a rename, which would replace shiny cat's pact with shiny cats pact instead.

The bulk update request #29441 (forum #296401) has been rejected by @nonamethanks.