Bump libsass from 0.21.0 to 0.23.0 in /requirements

Bumps [libsass](https://github.com/sass/libsass) from 0.21.0 to 0.23.0.
- [Release notes](https://github.com/sass/libsass/releases)
- [Commits](https://github.com/sass/libsass/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/common.txt

@@ -11,7 +11,7 @@ Django==4.2.14
 docutils==0.17.1
 feedparser==6.0.8
 Jinja2==3.1.4
-libsass==0.21.0
+libsass==0.23.0
 Pillow==10.4.0
 psycopg2==2.9.9
 Pygments==2.18.0