Meltano

<https://github.com/meltano/meltano/pull/9584|#9584 chore: Release v4.0.0>
Pull request opened by <https://github.com/MeltyBot|MeltyBot>
Bump changelog for release v4.0.0

## Docs Preview

• <https://deploy-preview-9584--meltano.netlify.app/|https://deploy-preview-9584--meltano.netlify.app/>
• <https://deploy-preview-9584--meltano.netlify.app/guide/v4-migration|Migration Guide>
• <https://deploy-preview-9584--meltano.netlify.app/changelog/2025-q3-updates-and-changes|2025 Q3 Changelog>
• <https://deploy-preview-9584--meltano.netlify.app/changelog/2025-q4-updates-and-changes|2025 Q4 Changelog>
<https://github.com/meltano/meltano|meltano/meltano>

<https://github.com/meltano/meltano/pull/9584|#9584 chore: Release v4.0.0>
Pull request merged by <https://github.com/edgarrmondragon|edgarrmondragon>
<https://github.com/meltano/meltano|meltano/meltano>