LTD-5128 Python3.9 upgrade

[markj0hnst0n]

Python3.9 upgrade and add typing-extensions package to ensure compatibility.

This has been deployed on the uat environment and tested manually. Results below.

Manual test case scenarios carried out using resend_edi_data_email.py management command:

• EDI data email sent from Spire and ingested by Lite HMRC system with correct db information (PASS)
• EDI data email sent on from Lite HMRC on to HMRC mailbox (PASS)
• LITE API call simulated and Email sent from Lite HMRC to HMRC mailbox (PASS)

Other manual testing:

• Health check viewed (PASS)
• Checked mailbox connections with mail/management/commands/check_mailserver_connections.py managment command (PASS)

[depsiatwal]

Has this been deployed any where ?
also @saruniitr or @currycoder any suggestions on testing this ?
similar to when we shifted to celery

[markj0hnst0n]

it's been deployed on UAT for a while @depsiatwal I've run some the mailbox check management commands and checked the healthcheck

[saruniitr]

Has this been deployed any where ? also @saruniitr or @currycoder any suggestions on testing this ? similar to when we shifted to celery

@markj0hnst0n @depsiatwal With celery all tasks were affected so tested all of them on UAT.
All of the testing is manual, there are test mailboxes attached to environments so we can use them to send licence data and reply messages as well.

[seijihg]

hehe if this just happened earlier :D had some stuffs earlier where I needed 3.9 instead of making a work around because we were on 3.8 xD

[hnryjmes]

agree with Arun's comment, if you can use the mailboxes we have for use with the UAT environment and simulate some licence mails that should be a good test of the version upgrade. but I think I don't know quite how to do that myself (!)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.11%. Comparing base (e17e70c) to head (fa9433e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #257   +/-   ##
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  Coverage   86.11%   86.11%           
=======================================
  Files          47       47           
  Lines        3039     3039           
  Branches      420      420           
=======================================
  Hits         2617     2617           
  Misses        334      334           
  Partials       88       88           

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