[deps] Update django-reversion requirement from ~=5.0.4 to ~=5.0.12

Updates the requirements on [django-reversion](https://github.com/etianen/django-reversion) to permit the latest version.
- [Release notes](https://github.com/etianen/django-reversion/releases)
- [Changelog](https://github.com/etianen/django-reversion/blob/master/CHANGELOG.rst)
- [Commits](etianen/django-reversion@v5.0.4...v5.0.12)

---
updated-dependencies:
- dependency-name: django-reversion
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,4 +1,4 @@
 openwisp-users @ https://github.com/openwisp/openwisp-users/tarball/master
 openwisp-utils[rest] @ https://github.com/openwisp/openwisp-utils/tarball/master
-django-reversion~=5.0.4
+django-reversion~=5.0.12
 openpyxl~=3.1.2