rename sanbe_futoshi -> sanpeita

BUR #6003 has been approved by @UnderCurve.

create alias sanbe_futoshi -> sanpeita

https://www.pixiv.net/users/7617385
https://twitter.com/three_vases_ta
Artist's twitter and pixiv bios both clearly list the intended pronunciation of 三瓶太 as さんぺいた (sanpeita) instead of "sanbe futoshi". Requesting tag rename based on this.

I can confirm. Voting yes.

topic #7713 for artist rename/alias BURs next time

Please don't manually rename it before requesting the BUR, especially for artist tag this large (70 posts). Just do the latter (and use create alias).

The bulk update request #6003 (forum #189625) has been approved by @UnderCurve.