fix(deps): update dependency reveal.js to v5.2.1

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "mermaid": "10.9.1",
     "mpegts.js": "1.7.3",
     "plyr": "3.7.8",
-    "reveal.js": "5.1.0",
+    "reveal.js": "5.2.1",
     "three": "0.164.1",
     "vidstack": "1.11.21",
     "vue": "3.4.27",