build(deps): bump posthog-js from 1.399.2 to 1.399.5 (#4434)

Bumps [posthog-js](https://github.com/PostHog/posthog-js) from 1.399.2 to 1.399.5.
- [Release notes](https://github.com/PostHog/posthog-js/releases)
- [Changelog](https://github.com/PostHog/posthog-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/PostHog/posthog-js/compare/posthog-js@1.399.2...posthog-js@1.399.5)

---
updated-dependencies:
- dependency-name: posthog-js
  dependency-version: 1.399.5
  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>

Author: dependabot[bot]

package-lock.json

@@ -60,7 +60,7 @@
     "lodash-es": "^4.18.1",
     "marked": "^18.0.6",
     "pinia": "^3.0.4",
-    "posthog-js": "^1.399.2",
+    "posthog-js": "^1.399.5",
     "video.js": "^8.23.9",
     "vue": "^3.5.39",
     "vue-router": "^5.1.0",