Bump gevent from 24.2.1 to 26.4.0

Bumps [gevent](https://github.com/gevent/gevent) from 24.2.1 to 26.4.0.
- [Release notes](https://github.com/gevent/gevent/releases)
- [Changelog](https://github.com/gevent/gevent/blob/master/docs/changelog_pre.rst)
- [Commits](gevent/gevent@24.2.1...26.4.0)

---
updated-dependencies:
- dependency-name: gevent
  dependency-version: 26.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements/production.txt

@@ -2,7 +2,7 @@
 
 -r base.txt
 
-gevent==24.2.1  # http://www.gevent.org/
+gevent==26.4.0  # http://www.gevent.org/
 gunicorn==26.0.0
 psycopg2-binary==2.9.9  # https://github.com/psycopg/psycopg2
 sentry-sdk[django]==2.60.0