Update GWELLS Python Version to 3.8

[fergmac]

Describe the task Bump up the Python version from 3.7 to at least 3.8, potentially 3.10.

Purpose We need to bump up Python in order to be able to continue to bump up app dependencies that drop support for Python version 3.7. Django 4.0 support 3.8, 3.9, 3.10

Acceptance Criteria

• [ ] Application builds with Python 3.8 (Potentially 3.9, 3.10)
• [ ] Django Version 3.2 suggests using 3.10

Additional context:

https://docs.djangoproject.com/en/4.0/releases/4.0/