fix(types): unwrap refs in this.$vuetify

[jacekkarczmarczyk]

Description

Typing for this.$vuetify doesn't unwrap refs
Discussion on discord: https://discord.com/channels/340160225338195969/660898563139567625/1047548064866521110

How Has This Been Tested?

wasn't (due to some unrelated technical problems)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

Alternative solution

  interface Vuetify {
    defaults: DefaultsInstance
    display: DisplayInstance
    theme: ThemeInstance
    icons: IconOptions
    locale: LocaleInstance & RtlInstance
  }

  export interface ComponentCustomProperties {
    $vuetify: UnwrapNestedRefs<Vuetify>
  }