Bump lunr from 0.7.0 to 2.3.9

Bumps [lunr](https://github.com/olivernn/lunr.js) from 0.7.0 to 2.3.9.
- [Release notes](https://github.com/olivernn/lunr.js/releases)
- [Changelog](https://github.com/olivernn/lunr.js/blob/master/CHANGELOG.md)
- [Commits](olivernn/lunr.js@v0.7.0...v2.3.9)

---
updated-dependencies:
- dependency-name: lunr
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -38,6 +38,6 @@
     "@popperjs/core": "^2.11.6",
     "anchor-js": "^4.3.1",
     "bootstrap": "^5.1.3",
-    "lunr": "^0.7.0"
+    "lunr": "^2.3.9"
   }
 }