Update dependency astro to ^5.17.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astro (source)	^5.17.2 → ^5.17.3

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Release Notes

withastro/astro (astro)

v5.17.3

Compare Source

Patch Changes

• #​15564 522f880 Thanks @​matthewp! - Add a default body size limit for server actions to prevent oversized requests from exhausting memory.

• #​15569 e01e98b Thanks @​matthewp! - Respect image allowlists when inferring remote image sizes and reject remote redirects.

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