Migrate to Python3

[papoteur-mga]

For the migration, I started from the last state of the main branch, then applied the patches from the python3 branch. Thus the last commits from the branch peds are not used,

[amotl]

Can you also update the CI/GHA configuration? From what I can see, adjusting those spots may be enough. Let's start with the Python version you are using on your workstation, and expand the test matrix later. You are currently using Python 3.8, right?

https://github.com/ip-tools/patzilla/blob/72d80e72d0e9871c37dd8948a7ea47bd078ee5b7/.github/workflows/tests.yaml#L29 https://github.com/ip-tools/patzilla/blob/72d80e72d0e9871c37dd8948a7ea47bd078ee5b7/.github/workflows/tests.yaml#L106

[codecov-commenter]

Codecov Report

Patch coverage: 33.25% and project coverage change: -7.47 :warning:

Comparison is base (0933634) 51.75% compared to head (c7af549) 44.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   51.75%   44.28%   -7.47%     
==========================================
  Files         100      100              
  Lines        7770     7878     +108     
==========================================
- Hits         4021     3489     -532     
- Misses       3749     4389     +640     

Flag	Coverage Δ
unittests	44.28% <33.25%> (-7.47%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
patzilla/access/epo/espacenet/pyramid.py	32.25% <ø> (ø)
patzilla/access/epo/ops/api.py	11.44% <0.00%> (-58.32%)	:arrow_down:
patzilla/access/epo/publicationserver/client.py	37.03% <0.00%> (+2.42%)	:arrow_up:
patzilla/access/generic/exceptions.py	42.85% <0.00%> (-13.25%)	:arrow_down:
patzilla/access/ificlaims/api.py	16.35% <0.00%> (+0.52%)	:arrow_up:
patzilla/access/office.py	15.21% <0.00%> (+1.88%)	:arrow_up:
patzilla/access/uspto/pdf.py	30.76% <0.00%> (+0.76%)	:arrow_up:
patzilla/navigator/services/__init__.py	46.66% <0.00%> (ø)
patzilla/navigator/services/admin.py	24.19% <0.00%> (+2.52%)	:arrow_up:
patzilla/navigator/services/dpma.py	27.27% <0.00%> (+4.10%)	:arrow_up:
... and 57 more

... and 11 files with indirect coverage changes

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