fix(deps): update dependency @keystone-6/auth to v8.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@keystone-6/auth (source)	8.0.0 -> 8.1.0

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Release Notes

keystonejs/keystone (@​keystone-6/auth)

### [`v8.1.0`](https://redirect.github.com/keystonejs/keystone/compare/@keystone-6/auth@8.0.0...@keystone-6/auth@8.1.0) [Compare Source](https://redirect.github.com/keystonejs/keystone/compare/@keystone-6/auth@8.0.0...@keystone-6/auth@8.1.0)

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