Flag d should not be considered valid in ES2021

[fasttime]

Regexp flag d was introduced in ES2022. It should not be considered valid with ecmaVersion: 2021, i.e.:

import { RegExpValidator } from "@eslint-community/regexpp";
const validator = new RegExpValidator({ ecmaVersion: 2021 });
validator.validateFlags("d");

The above code should throw an error. It did so with version 4.11.2, but in version 4.12.0, no error is thrown.

[github-actions]

🎉 This issue has been resolved in version 4.12.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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