chore: bump assets from a1c722e to 5eff51e (#508)

Bumps [assets](https://github.com/hexojs/hexo-starter) from `a1c722e` to `5eff51e`.
- [Commits](hexojs/hexo-starter@a1c722e...5eff51e)

---
updated-dependencies:
- dependency-name: assets
  dependency-type: direct:production
...

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