chore: switch to @tony.ganchev/eslint-plugin-header

[tonyganchev]

Reasons

• Supports ESLint 9 without hacks.
• TypeScript bindings.
• Proper Windows support.
• In active development.
• More informative error messages, not just all or nothing.

Note: I switched the rule config to the plugins modern object-oriented format but this can be reverted.

[tonyganchev]

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