Update requirements.txt based on Argo CD version

[jgwest]

What does this PR do / why we need it:

• Update to latest jinja version based on Argo CD requirements.txt

Have you updated the necessary documentation? N/A

• [ ] Documentation update is required by this PR, and has been updated.

Which issue(s) this PR fixes: N/A

How to test changes / Special notes to the reviewer:

[jgwest]

Tested on readthedocs.org, and working as expected.