chore(deps): bump the npm group with 2 updates (#996)

Bumps the npm group with 2 updates: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) and [sharp](https://github.com/lovell/sharp).


Updates `astro` from 5.15.3 to 5.15.4
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@5.15.4/packages/astro)

Updates `sharp` from 0.34.4 to 0.34.5
- [Release notes](https://github.com/lovell/sharp/releases)
- [Commits](lovell/sharp@v0.34.4...v0.34.5)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: sharp
  dependency-version: 0.34.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
...

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Author: dependabot[bot]