chore: bump chart.js from 3.5.0 to 3.9.1 in /site (#4294)

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 3.5.0 to 3.9.1.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](https://github.com/chartjs/Chart.js/compare/v3.5.0...v3.9.1)

---
updated-dependencies:
- dependency-name: chart.js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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site/package.json

@@ -38,7 +38,7 @@
     "@xstate/react": "3.0.1",
     "axios": "0.26.1",
     "can-ndjson-stream": "1.0.2",
-    "chart.js": "3.5.0",
+    "chart.js": "3.9.1",
     "chartjs-adapter-date-fns": "2.0.0",
     "cron-parser": "4.6.0",
     "cronstrue": "2.11.0",