fix(deps): update dependency astro to v5.15.7

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This PR contains the following updates:

Package	Change	Age	Confidence
astro (source)	5.15.6 -> 5.15.7

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Release Notes

withastro/astro (astro)

v5.15.7

Compare Source

Patch Changes

• #​14765 03fb47c Thanks @​florian-lefebvre! - Fixes a case where process.env wouldn't be properly populated during the build

• #​14690 ae7197d Thanks @​fredriknorlin! - Fixes a bug where Astro's i18n fallback system with fallbackType: 'rewrite' would not generate fallback files for pages whose filename started with a locale key.

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