Bump pygments from 2.15.1 to 2.16.1

Bumps [pygments](https://github.com/pygments/pygments) from 2.15.1 to 2.16.1.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.15.1...2.16.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/base.txt

@@ -17,7 +17,7 @@ psycopg2-binary==2.9.6
 pytz==2023.3
 static==1.1.1
 whitenoise[brotli]==6.5.0
-pygments==2.15.1
+pygments==2.16.1
 wordcloud==1.9.2
 django-admin-csvexport==2.2
 markdown==3.4.4