fix(deps): update dependency astro to v4.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astro (source)	4.15.5 -> 4.15.6

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Release Notes

withastro/astro (astro)

v4.15.6

Compare Source

Patch Changes

• #​11993 ffba5d7 Thanks @​matthewp! - Fix getStaticPaths regression

  This reverts a previous change meant to remove a dependency, to fix a regression with multiple nested spread routes.

• #​11964 06eff60 Thanks @​TheOtterlord! - Add wayland (wl-copy) support to astro info

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