build(deps): bump astro in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the / directory: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 4.16.10 to 4.16.18
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/astro@4.16.18/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@4.16.18/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -18,7 +18,7 @@
     "@netlify/functions": "^2.8.1",
     "@types/react": "^18.2.79",
     "@types/react-dom": "^18.2.25",
-    "astro": "^4.16.10",
+    "astro": "^4.16.18",
     "blobshape": "^1.0.0",
     "marked": "^14.0.0",
     "marked-shiki": "^1.1.0",