chore(deps): block dirty-chai major updates (requires chai 6)

[Alyar666]

Summary

Renovate keeps proposing a major dirty-chai upgrade (2.x → 3.x, see #105), but that update cannot work with the current test setup and fails every CI test job.

dirty-chai v3 requires chai 6 (peer dependency chai: '>=6.2.0 <7'), while this project is intentionally pinned to chai v4 (see #103). chai v5+ is ESM-only, so dirty-chai@3 is ESM-only too, and our CommonJS Mocha harness loads it via require:

// spec/config/setup.js
chai.use(require('dirty-chai'));

With dirty-chai@3 the test bootstrap fails before a single test runs (same failure mode as the blocked chai v6 bump):

ERROR [ERR_MODULE_NOT_FOUND]: Cannot find module '.../spec/config/setup'
       imported from .../mocha/lib/nodejs/esm-utils.js

This is exactly the situation #103 anticipated:

the plugins would need work too (dirty-chai requires ^3 for chai 6 ...), so moving to chai 6 is a dedicated ESM migration, not a dependency bump.

This PR disables major dirty-chai updates in Renovate (minor/patch within 2.x stay enabled), mirroring the existing chai and path-to-regexp rules. Once merged, Renovate will stop re-opening the dirty-chai v3 PR, so #105 can be closed.

[Copilot]

Pull request overview

Disables Renovate major updates for dirty-chai because dirty-chai@3 requires chai@6 (ESM-only) while this repo intentionally remains on chai@4 due to a CommonJS Mocha test harness.

Changes:

• Add a Renovate packageRules entry to block major upgrades of dirty-chai.
• Document the rationale inline (peer dependency on chai 6 / ESM incompatibility with current test setup).

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