build(deps): bump mobx from 6.12.3 to 6.12.5 in /website (#680)

Bumps [mobx](https://github.com/mobxjs/mobx) from 6.12.3 to 6.12.5.
- [Release notes](https://github.com/mobxjs/mobx/releases)
- [Commits](https://github.com/mobxjs/mobx/compare/mobx@6.12.3...mobx@6.12.5)

---
updated-dependencies:
- dependency-name: mobx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

website/package.json

@@ -17,7 +17,7 @@
     "common-tags": "^1.8.2",
     "date-fns": "^3.6.0",
     "google-protobuf": "^4.0.0-rc.2",
-    "mobx": "^6.12.3",
+    "mobx": "^6.12.5",
     "mobx-react": "^9.1.1",
     "mobx-utils": "^6.0.8",
     "numeral": "^2.0.6",