fix(deps): update dependency reveal.js to v6

Author: renovate[bot]

packages/starlight-theme-openscript/package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "@types/reveal.js": "^5.2.2",
-    "reveal.js": "^5.2.1"
+    "reveal.js": "^6.0.0"
   },
   "engines": {
     "node": ">=22"