chore(deps-dev): bump @docusaurus/tsconfig from 3.8.1 to 3.9.1 in /docs (#35376)

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docs/package.json

@@ -69,7 +69,7 @@
   },
   "devDependencies": {
     "@docusaurus/module-type-aliases": "^3.9.1",
-    "@docusaurus/tsconfig": "^3.8.1",
+    "@docusaurus/tsconfig": "^3.9.1",
     "@eslint/js": "^9.37.0",
     "@types/react": "^19.1.8",
     "@typescript-eslint/eslint-plugin": "^8.37.0",