[v6] Update astro/zod docs for Zod 4 + code snippets in other pages

[ArmandPhilippot]

Description (required)

• Updates modules/astro-zod.mdx to udpate the links and code snippets for Zod 4
• Checks and updates the code snippets using Zod in other pages

I installed Zod 4 locally to check our code snippets. It seems that, except a few small changes around url()/email(), everything is still valid!

Related issues & labels (optional)

• Related: Add section on Zod 4 to v6 migration guide #12848
• Suggested label: v6

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[sarah11918]

Looks great! Just left one little suggestion.

So, I wonder whether we should consider mentioning the change to email() and url() in our upgrade guide, since people may very well have built things based on our existing code examples.

[ArmandPhilippot]

z.string().email() and z.string().url() still work but they are deprecated: https://zod.dev/v4/changelog#deprecates-email-etc
So, not really breaking. But, yes, we could quote a few examples and say "check the Zod changelog for more"!