build(deps-dev): bump @firebase/app-compat from 0.2.13 to 0.2.15 (#2263)

Bumps [@firebase/app-compat](https://github.com/firebase/firebase-js-sdk/tree/HEAD/packages/app-compat) from 0.2.13 to 0.2.15.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/master/packages/app-compat/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/commits/@firebase/app-compat@0.2.15/packages/app-compat)

---
updated-dependencies:
- dependency-name: "@firebase/app-compat"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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