Remove unused dependencies pyasn1 and cryptography (python-jose)

[kinow]

Closes #8

Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [x] Reset the build number to 0 (if the version changed)
• [ ] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

Removing these two packages as I believe they were added to the first versions of the recipe via python-jose, and were not removed after we updated our code/deps.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[kinow]

For next release I think. Assuming build passes and it validates the cylc --version command is working, and perhaps also some local testing to confirm it can to handle security without these two packages :thinking:

[kinow]

(draft to avoid accidental merge)

[oliver-sanders]

Superseded by #26