chore(deps-dev): bump astro from 2.1.7 to 2.1.9 (#5030)

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 2.1.7 to 2.1.9.
- [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@2.1.9/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -59,7 +59,7 @@
     "@rollup/plugin-typescript": "^11.0.0",
     "@typescript-eslint/eslint-plugin": "^5.57.0",
     "@typescript-eslint/parser": "^5.57.0",
-    "astro": "^2.1.7",
+    "astro": "^2.1.9",
     "autoprefixer": "^10.4.14",
     "bootstrap": "^5.3.0-alpha2",
     "bundlewatch": "^0.3.3",