Bump themes/hextra from bc778ee to 655148f (#40)

Bumps [themes/hextra](https://github.com/imfing/hextra) from `bc778ee` to `655148f`.
- [Release notes](https://github.com/imfing/hextra/releases)
- [Commits](imfing/hextra@bc778ee...655148f)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>