Bump @antora/lunr-extension in /antora

---
updated-dependencies:
- dependency-name: "@antora/lunr-extension"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

antora/package-lock.json

@@ -23,7 +23,7 @@
     "node": "20"
   },
   "dependencies": {
-    "@antora/lunr-extension": "^1.0.0-alpha.9",
+    "@antora/lunr-extension": "^1.0.0-alpha.10",
     "@asciidoctor/tabs": "^1.0.0-beta.6"
   }
 }