Bump themes/hextra from de9f9b3 to d367a44 (#18)

Bumps [themes/hextra](https://github.com/imfing/hextra) from `de9f9b3` to `d367a44`.
- [Release notes](https://github.com/imfing/hextra/releases)
- [Commits](imfing/hextra@de9f9b3...d367a44)

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

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