[v6] clean deprecated APIs

[florian-lefebvre]

Co-authored-by: Sarah Rainsberger 5098874+sarah11918@users.noreply.github.com

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I don't think docs need to be updated elsewhere because the things getting deprecated were already not documented anymore

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For Astro version: 6.0. See astro PR #14462.

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[ArmandPhilippot]

A small nit, otherwise this looks good. And I couldn't find any occurrences elsewhere in the docs. So yes, I think there is nothing else to update!

[sarah11918]

These look great! As you'll notice, because these are potentially "silent killers" hiding in waiting, deprecated a long time ago but then just been hanging around... I was a little more forceful in describing that they need to be removed for the specific reason that they'll now cause errors vs just saying they're not necessary anymore. These feel like things that could secretly have been hiding in people's projects for a long time if they exist, so maybe worth being a bit extra here.

[sarah11918]

I was about to correct this, thinking you surely meant it was deprecated in 5.0, but nope! It has stuck around! 😂

[sarah11918]

One tiny more suggestion in keeping with the others, but LGTM!