Change "criteria" to "criterion" when used in singular form

[DePasqualeOrg]

closes #1321

[CLAassistant]

All committers have signed the CLA.

[janpio]

Ohoh, we might have that in a few more places 😆
https://github.com/prisma/prisma-engines/search?q=a+unique+criteria

[Jolg42]

Thanks! This would need to first be changed in the prisma-engines repository where the error comes from (see Jan's link)

[Druue]

Good to go!