feat(utils): use mergeable interface for settings property (again)

[G-Rath]

PR Checklist

• Addresses an existing open issue: fixes #000
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

It looks like #3556 got "undone" at some point - its now a type which can't be merged with; sadly I only noticed this after the next next major came out so I'll still need to use a type-cast 😞

[typescript-eslint]

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• nx test type-utils --coverage=false
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• nx test typescript-estree --coverage=false
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• nx test repo-tools --coverage=false
• nx test ast-spec --coverage=false
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• nx test rule-schema-to-typescript-types --coverage=false
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