chore(deps): bump openai from 6.9.1 to 6.15.0

Bumps [openai](https://github.com/openai/openai-node) from 6.9.1 to 6.15.0.
- [Release notes](https://github.com/openai/openai-node/releases)
- [Changelog](https://github.com/openai/openai-node/blob/master/CHANGELOG.md)
- [Commits](openai/openai-node@v6.9.1...v6.15.0)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 6.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "selfsigned": "^5.2.0",
     "mp3-duration": "^1.1.0",
     "nconf": "^0.13.0",
-    "openai": "^6.9.1",
+    "openai": "^6.15.0",
     "posthog-node": "^5.15.0",
     "sonos": "^1.14.2",
     "soundcraft-ui-connection": "^4.0.0",