Deprecate @astrojs/db

[ArmandPhilippot]

Description (required)

Adds a callout in integrations-guide/db.mdx and guides/astro-db.mdx to warn about @astrojs/db deprecation.

We might need to update the Astro version if this isn't shipped with withastro/astro#16972.

Related issues & labels (optional)

• Suggested label: update or improve documentation

For Astro version: 6.4.5. See astro PR #16964.

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Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.