i18n(de): translate guides/upgrade-to/v4.mdx

[trueberryless]

Description (required)

• translate guides/upgrade-to/v4.mdx

Links should be fixed:

• [ # ] /de/guides/integrations-guide/#manuelle-aktualisierung -> when i18n(de): update guides/integration-guide/index.mdx #10441

Related issues & labels (optional)

• Suggested label: i18n

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[trueberryless]

Needs some updates, so drafting for now...

[trueberryless]

I think this PR should be up-to-date, but there is one link to the integration guide (this file is outdated in German), so I cannot link to the English heading and the German heading doesn't exist yet...

Not sure what to do, maybe just link to the German page without heading, so checks are passing?

(there is a draft PR updating the integration guide, but it is out-of-date, but it would add the heading...)

[yanthomasdev]

Since the other page needed for this one is outdated and closed for staleness, I'll also be closing this one, but do feel free to open it again later when things get updated!