chore: bump themes/hextra from 62196dd to 089c2fb

Bumps [themes/hextra](https://github.com/imfing/hextra) from `62196dd` to `089c2fb`.
- [Release notes](https://github.com/imfing/hextra/releases)
- [Commits](imfing/hextra@62196dd...089c2fb)

---
updated-dependencies:
- dependency-name: themes/hextra
  dependency-version: '089c2fb5e19a119222046d48190ac980d42d9170'
  dependency-type: direct:production
...

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Author: dependabot[bot]