[UPDATE] Bump libsass from 0.21.0 to 0.22.0 (#640)

Bumps [libsass](https://github.com/sass/libsass-python) from 0.21.0 to 0.22.0.
- [Release notes](https://github.com/sass/libsass-python/releases)
- [Changelog](https://github.com/sass/libsass-python/blob/main/docs/changes.rst)
- [Commits](https://github.com/sass/libsass-python/compare/0.21.0...0.22.0)

---
updated-dependencies:
- dependency-name: libsass
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -35,7 +35,7 @@ reportlab = "^3.6"
 django-haystack = "^3.2.1"
 xapian-haystack = "^3.0.1"
 xapian-bindings = "^0.1.0"
-libsass = "^0.21"
+libsass = "^0.22"
 django-ordered-model = "^3.6"
 django-simple-captcha = "^0.5.17"
 python-dateutil = "^2.8.2"