build(deps): bump amplitude-js from 8.12.0 to 8.13.1 in /website/client

Bumps [amplitude-js](https://github.com/amplitude/amplitude-javascript) from 8.12.0 to 8.13.1.
- [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/v8.12.0...v8.13.1)

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

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

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": "^8.12.0",
+    "amplitude-js": "^8.13.1",
     "axios": "^0.24.0",
     "axios-progress-bar": "^1.2.0",
     "babel-eslint": "^10.1.0",