Bump the npm_and_yarn group across 1 directory with 4 updates (#17)

Bumps the npm_and_yarn group with 2 updates in the / directory: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) and [postcss](https://github.com/postcss/postcss).


Updates `astro` from 6.1.8 to 6.4.6
- [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@6.4.6/packages/astro)

Updates `devalue` from 5.7.1 to 5.8.1
- [Release notes](https://github.com/sveltejs/devalue/releases)
- [Changelog](https://github.com/sveltejs/devalue/blob/main/CHANGELOG.md)
- [Commits](sveltejs/devalue@v5.7.1...v5.8.1)

Updates `postcss` from 8.5.8 to 8.5.15
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.8...8.5.15)

Updates `vite` from 7.3.1 to 7.3.5
- [Release notes](https://github.com/vitejs/vite/releases)
- [Changelog](https://github.com/vitejs/vite/blob/v7.3.5/packages/vite/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite/commits/v7.3.5/packages/vite)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.6
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: devalue
  dependency-version: 5.8.1
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: postcss
  dependency-version: 8.5.15
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: vite
  dependency-version: 7.3.5
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/mdx": "^5.0.3",
     "@astrojs/sitemap": "^3.3.1",
-    "astro": "^6.1.8"
+    "astro": "^6.4.6"
   },
   "devDependencies": {
     "@tailwindcss/vite": "^4.1.1",