Bump @babylonjs/core from 6.5.0 to 6.6.1 in /docs/visualiser

Bumps [@babylonjs/core](https://github.com/BabylonJS/Babylon.js) from 6.5.0 to 6.6.1.
- [Release notes](https://github.com/BabylonJS/Babylon.js/releases)
- [Changelog](https://github.com/BabylonJS/Babylon.js/blob/master/CHANGELOG.md)
- [Commits](BabylonJS/Babylon.js@6.5.0...6.6.1)

---
updated-dependencies:
- dependency-name: "@babylonjs/core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/visualiser/package.json

@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "@babylonjs/core": "^6.5.0",
+    "@babylonjs/core": "^6.6.1",
     "@babylonjs/gui": "^6.0.0"
   },
   "devDependencies": {