Upgrade ESLint to v9 and eslint-plugin-unicorn to v62 with flat config migration#441

Jamie-BitFlight merged 7 commits intodependabot/npm_and_yarn/eslint-plugin-unicorn-62.0.0bitflight-devops/github-action-readme-generator:dependabot/npm_and_yarn/eslint-plugin-unicorn-62.0.0from

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