Remove cast for jose.fields. (#9228)

* Remove cast for jose.fields.

https://github.com/certbot/certbot/pull/9073 references this.

* Some of them can't be removed, though.

* Fix josepy type hints of json

* Increase josepy pinning version.

Note that the repin scripts have not been used.

* Run repin scripts.

* Fix constraints

certbot/setup.py

@@ -52,7 +52,7 @@ install_requires = [
     'configobj>=5.0.6',
     'cryptography>=2.5.0',
     'distro>=1.0.1',
-    'josepy>=1.9.0',
+    'josepy>=1.13.0',
     'parsedatetime>=2.4',
     'pyrfc3339',
     'pytz>=2019.3',