fix: accept an array of strings when using the not predicate type

[lihbr]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

not predicate type was not aligned with API expectations, see: prismicio/prismic-types#35

Checklist:

• My change requires an update to the official documentation.
  PR: https://prismicio-docs-v3.prismic.io/documents~w=rest%20api%20technical&b=working&c=release%3AYo3rmxIAACMAlRcT&l=en-us/X7vlhRIAACYAdOzP/?section=Page%20Content
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

[github-actions]

size-limit report 📦

Path	Size
dist/index.js	4.02 KB (0%)
dist/index.cjs	6.88 KB (0%)

[lihbr]

@angeloashmore, may I let you merge this one when you're ready with #240?

[angeloashmore]

Perfect! I'll publish along with #240.