PYTHON-2517 Remove any Jython specific code or workarounds

[blink1073]

PYTHON-2517

Changes in this PR

Remove any specific workarounds for Jython, which was no longer supported when we dropped Python 2 support.

Test Plan

Standard test matrix

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[Jibola]

LGTM