build(deps): bump astro from 4.16.3 to 4.16.18 (#431)

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 4.16.3 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
...

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

package.json

@@ -17,7 +17,7 @@
     "@astrojs/check": "^0.9.3",
     "@astrojs/rss": "^4.0.7",
     "@resvg/resvg-js": "^2.6.2",
-    "astro": "^4.16.3",
+    "astro": "^4.16.18",
     "fuse.js": "^7.0.0",
     "lodash.kebabcase": "^4.1.1",
     "remark-collapse": "^0.1.2",