constellation_client in the nightly build is not compatible with older versions of Python

[OrionsGuardian]

Prerequisites

• [ ] Put an X between the brackets on this line if you have done all of the following:

  • Running the latest version of Constellation

  • Attached the Support Package via Help > Support Package

  • Checked the FAQs: https://github.com/constellation-app/constellation/wiki/FAQ

  • Checked that your issue isn’t already filed: https://github.com/constellation-app/constellation/issues

  • Checked that there is not already a module that provides the described functionality: https://github.com/constellation-app/constellation/wiki/Catalogue-of-Repositories

Description

Trying to run Jupyter Notebook with the Linux nightly build has shown this problem.

This is from testing on a Centos 7 Linux box where the latest release of Python was version 3.6.8. The new code apparently requires Python 3.9 or later.

I would suggest changing the code to remain compatible with older versions of Python (3.6 onwards)

Behaviour

Expected behaviour: Expect to be able to continue using Centos 7 Linux with Python 3.6.8 to run Jupyter Notebooks connecting to Constellation.

Actual behaviour: Fails to import the constellation_client.py due to new code requiring a later release of Python.

Reproduces how often: 100%

[HolandCrick]

@Quasar985 thanks for your help to fix the code. Both issues (#2176 and #2165) are working correctly now on the Linux Box.