Bump @11ty/eleventy from 3.0.0-alpha.6 to 3.0.0-alpha.9

Bumps [@11ty/eleventy](https://github.com/11ty/eleventy) from 3.0.0-alpha.6 to 3.0.0-alpha.9.
- [Release notes](https://github.com/11ty/eleventy/releases)
- [Changelog](https://github.com/11ty/eleventy/blob/main/docs/release-instructions.md)
- [Commits](https://github.com/11ty/eleventy/commits/v3.0.0-alpha.9)

---
updated-dependencies:
- dependency-name: "@11ty/eleventy"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
     "bootstrap-scss": "^4.6.2"
   },
   "devDependencies": {
-    "@11ty/eleventy": "3.0.0-alpha.6",
+    "@11ty/eleventy": "3.0.0-alpha.9",
     "firebase-tools": "^13.7.4",
     "hast-util-from-html": "^2.0.1",
     "hast-util-select": "^6.0.2",