fix: Remove out-of-date note from CONTRIBUTING.md

[eyalkutz]

fixes #14985

[changeset-bot]

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Latest commit: d2cbe66

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[Rich-Harris]

preview: https://svelte-dev-git-preview-svelte-14986-svelte.vercel.app/

this is an automated message

[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@14986

[paoloricciuti]

Can you add a test for it to prevent regressions?

[paoloricciuti]

LoL just joking...thanks! 😁