Update jinja2 requirement from <3.1 to <3.2

Updates the requirements on [jinja2](https://github.com/pallets/jinja) to permit the latest version.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.0rc1...3.1.2)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: direct:production
...

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

requirements.txt

@@ -2,6 +2,6 @@ pynacl>=1.4.0
 requests>=2.14.0
 pyjwt>=2.0
 sphinx<3
-Jinja2<3.1
+Jinja2<3.2
 sphinx-rtd-theme<1.1
 Deprecated