Update josepy requirement from <2 to <3 (#4708)

Updates the requirements on [josepy](https://github.com/certbot/josepy) to permit the latest version.
- [Release notes](https://github.com/certbot/josepy/releases)
- [Changelog](https://github.com/certbot/josepy/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/certbot/josepy/compare/1.0.0...v2.1.0)

---
updated-dependencies:
- dependency-name: josepy
  dependency-version: 2.1.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Joakim Sørensen <joasoe@proton.me>

requirements_test.txt

@@ -1,7 +1,7 @@
 --requirement requirements_base.txt
 asynctest==0.13.0
 freezegun==1.5.3
-josepy<2
+josepy<3
 pytest==8.4.1
 pytest-asyncio==0.26.0
 pytest-cov==6.2.1