Bump twisted from 25.5.0 to 26.4.0rc2

Bumps [twisted](https://github.com/twisted/twisted) from 25.5.0 to 26.4.0rc2.
- [Release notes](https://github.com/twisted/twisted/releases)
- [Changelog](https://github.com/twisted/twisted/blob/trunk/NEWS.rst)
- [Commits](twisted/twisted@twisted-25.5.0...twisted-26.4.0rc2)

---
updated-dependencies:
- dependency-name: twisted
  dependency-version: 26.4.0rc2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-3.13.txt

@@ -47,7 +47,7 @@ setuptools==82.0.1
 six==1.17.0
 SQLAlchemy==2.0.49
 treq==25.5.0
-Twisted==25.5.0
+Twisted==26.4.0rc2
 txaio==25.12.2
 typing_extensions==4.15.0
 ujson==5.12.1