Switch to zoneinfo from pytz

[matmair]

We target 3.9 which has zoneinfo for timezone info instead of pytz.

[netlify]

✅ Deploy Preview for inventree-web-pui-preview canceled.

Name	Link
🔨 Latest commit	3ff48b4
🔍 Latest deploy log	https://app.netlify.com/sites/inventree-web-pui-preview/deploys/6745092d1717360008fd9d4c

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (594dc49) to head (3ff48b4).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/InvenTree/helpers.py	60.00%	2 Missing ⚠️
src/backend/InvenTree/report/tests.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7645      +/-   ##
==========================================
- Coverage   84.57%   78.66%   -5.91%     
==========================================
  Files        1178     1128      -50     
  Lines       53710    57695    +3985     
  Branches     2027     1440     -587     
==========================================
- Hits        45425    45386      -39     
- Misses       7779    11931    +4152     
+ Partials      506      378     -128     

Flag	Coverage Δ
backend	85.96% <77.77%> (-0.01%)	⬇️

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[SchrodingersGat]

Nice. Should we also remove pytz from the requirements?

[matmair]

@SchrodingersGat sadly not, some of our dependencies still depend on it

[matmair]

I need to figure out why CI works on my machine but not on GH

[matmair]

This is more complex than initially thought. https://blog.ganssle.io/articles/2018/03/pytz-fastest-footgun.html
I am amazed we have not had problems with pytz before.

[SchrodingersGat]

Wow, what a deep dive!

[SchrodingersGat]

@matmair it would be great to get this one closed out if you have some time to assign to it :)

[matmair]

@SchrodingersGat this is more a skill not a time issue ;-) I can look into it after sso and selection lists

[SchrodingersGat]

Ok, LMK if you are banging your head against the wall on it!