Bump wiki from 0.5 to 0.7.9

Bumps [wiki](https://github.com/django-wiki/django-wiki) from 0.5 to 0.7.9.
- [Release notes](https://github.com/django-wiki/django-wiki/releases)
- [Changelog](https://github.com/django-wiki/django-wiki/blob/main/docs/release_notes.rst)
- [Commits](django-wiki/django-wiki@releases/0.5...releases/0.7.9)

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

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Author: dependabot[bot]