refactor: simplify new-parens rule schema

[mho22]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[x] Other, please explain:

Refactor an existing rule [ new-parens ] schema. It programmatically works but it shouldn't be written this way [ anyOf ]. Related link here.

What changes did you make? (Give an overview)

I modified the current schema :

schema: {
        anyOf: [
        {
            type: "array",
            items: [
                {
                    enum: ["always", "never"]
                }
            ],
            minItems: 0,
            maxItems: 1
        }
    ]
},

into simplified schema :

schema: [
    {
        enum: ["always", "never"]
    }
]

Is there anything you'd like reviewers to focus on?

no

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[mdjermanovic]

LGTM, thanks!