i18n(de): update guides/deploy/google-firebase.mdx

[trueberryless]

Description (required)

• update guides/deploy/google-firebase.mdx

Related issues & labels (optional)

• 5.0.0 beta docs #9240
• Suggested label: i18n

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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.