v6: tsconfig template update

[florian-lefebvre]

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For Astro version: 6.x. See astro PR #15668.

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🔄️	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.

[sarah11918]

Moved it myself by editing the file. Otherwise, good to go!

[sarah11918]

This can merge when the feature is released in withastro/astro#15687 !