Removing unnecessary types

[JedWatson]

Just noticed that on a fresh install, we get the following warnings in the console:

warning @keystone-next/auth > @keystone-ui/fields > @types/react-select@5.0.1: This is a stub types definition. react-select provides its own type definitions, so you do not need this installed.
warning @keystone-next/keystone > @keystone-ui/options > @types/react-select@5.0.1: This is a stub types definition. react-select provides its own type definitions, so you do not need this installed.
warning @keystone-next/keystone > @types/form-data@2.5.0: This is a stub types definition. form-data provides its own type definitions, so you do not need this installed.

I can vouch in particular for types being included in react-select@5.x so I've removed both dependencies.

[changeset-bot]

🦋 Changeset detected

Latest commit: b933971

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@keystone-ui/fields	Patch
@keystone-ui/options	Patch
@keystone-next/keystone	Patch

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