Bump treq from 22.2.0 to 26.7.0

Bumps [treq](https://github.com/twisted/treq) from 22.2.0 to 26.7.0.
- [Release notes](https://github.com/twisted/treq/releases)
- [Changelog](https://github.com/twisted/treq/blob/trunk/CHANGELOG.rst)
- [Commits](twisted/treq@release-22.2.0...treq-26.7.0)

---
updated-dependencies:
- dependency-name: treq
  dependency-version: 26.7.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements/tox-tests.txt

@@ -1,3 +1,3 @@
 idna==3.18
 treq==25.5.0; python_version >= '3.13'
-treq==22.2.0; python_version < '3.13'
+treq==26.7.0; python_version < '3.13'