build(deps): bump amplitude-js from 8.21.1 to 8.21.3 in /website/client (#14402)

Bumps [amplitude-js](https://github.com/amplitude/amplitude-javascript) from 8.21.1 to 8.21.3.
- [Release notes](https://github.com/amplitude/amplitude-javascript/releases)
- [Changelog](https://github.com/amplitude/Amplitude-JavaScript/blob/main/CHANGELOG.md)
- [Commits](https://github.com/amplitude/amplitude-javascript/compare/v8.21.1...v8.21.3)

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

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website/client/package.json

@@ -25,7 +25,7 @@
     "@vue/cli-plugin-unit-mocha": "^4.5.15",
     "@vue/cli-service": "^4.5.15",
     "@vue/test-utils": "1.0.0-beta.29",
-    "amplitude-js": "^8.21.1",
+    "amplitude-js": "^8.21.3",
     "axios": "^0.27.2",
     "axios-progress-bar": "^1.2.0",
     "babel-eslint": "^10.1.0",