Update dependency pangu to v6 (#318)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "medium-zoom": "1.1.0",
     "mermaid": "11.7.0",
     "pace-js": "1.2.4",
-    "pangu": "4.0.7",
+    "pangu": "6.1.3",
     "pdfobject": "2.3.1",
     "prism-themes": "1.9.0",
     "prismjs": "1.30.0",