chore(deps-dev): bump firebase-tools from 12.8.0 to 12.9.1

Bumps [firebase-tools](https://github.com/firebase/firebase-tools) from 12.8.0 to 12.9.1.
- [Release notes](https://github.com/firebase/firebase-tools/releases)
- [Changelog](https://github.com/firebase/firebase-tools/blob/master/CHANGELOG.md)
- [Commits](firebase/firebase-tools@v12.8.0...v12.9.1)

---
updated-dependencies:
- dependency-name: firebase-tools
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -21,7 +21,7 @@
     "@vuepress/plugin-prismjs": "2.0.0-beta.67",
     "@vuepress/plugin-shiki": "2.0.0-rc.0",
     "@vuepress/theme-default": "2.0.0-beta.67",
-    "firebase-tools": "^12.8.0",
+    "firebase-tools": "^12.9.1",
     "markdown-it-anchor": "^8.6.7",
     "markdown-it-attrs": "^4.1.6",
     "nodemon": "^3.0.1",