fix(deps): update astro to v5.15.5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
astro (source)	5.15.4 -> 5.15.5

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Release Notes

withastro/astro (astro)

v5.15.5

Compare Source

Patch Changes

• #​14712 91780cf Thanks @​florian-lefebvre! - Fixes a case where build's process.env would be inlined in the server output

• #​14713 666d5a7 Thanks @​florian-lefebvre! - Improves fallbacks generation when using the experimental Fonts API

• #​14743 dafbb1b Thanks @​matthewp! - Improves X-Forwarded header validation to prevent cache poisoning and header injection attacks. Now properly validates X-Forwarded-Proto, X-Forwarded-Host, and X-Forwarded-Port headers against configured allowedDomains patterns, rejecting malformed or suspicious values. This is especially important when running behind a reverse proxy or load balancer.

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