Bump themes/hextra from bbe3c46 to c60d1f5 (#50)

Bumps [themes/hextra](https://github.com/imfing/hextra) from `bbe3c46` to `c60d1f5`.
- [Release notes](https://github.com/imfing/hextra/releases)
- [Commits](imfing/hextra@bbe3c46...c60d1f5)

---
updated-dependencies:
- dependency-name: themes/hextra
  dependency-type: direct:production
...

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