feat: Added Django 3.2 and Python 3.8 and 3.9 support

[Aiky30]

• remove python_2_unicode_compatible

• remove file # -- coding: utf-8 -- declarations

• remove python2 future imports and six primitive types

• replaced lru cache imports to: from functools import lru_cache

• remapped import for ACTION_CHECKBOX_NAME

• replaced ugettext with gettext, ugettext_lazy with gettext_lazy, and ungettext with ngettext

• test assertEquals replaced with assertEqual

• replaced force_text() with force_str(), https://docs.djangoproject.com/en/3.2/ref/utils/#django.utils.encoding.force_text

• moved from django.conf.urls.url() to django.urls.re_path()

[codecov-commenter]

Codecov Report

Merging #196 (25a7f44) into release/1.0.x (ce89c1b) will decrease coverage by 0.14%. The diff coverage is 92.50%.

@@                Coverage Diff                @@
##           release/1.0.x     #196      +/-   ##
=================================================
- Coverage          84.25%   84.11%   -0.15%     
=================================================
  Files                 23       23              
  Lines               1747     1731      -16     
  Branches             220      280      +60     
=================================================
- Hits                1472     1456      -16     
  Misses               245      245              
  Partials              30       30              

Impacted Files	Coverage Δ
djangocms_moderation/handlers.py	46.15% <ø> (-3.85%)	:arrow_down:
djangocms_moderation/managers.py	60.00% <ø> (-1.12%)	:arrow_down:
djangocms_moderation/admin.py	78.45% <70.00%> (-0.08%)	:arrow_down:
djangocms_moderation/admin_actions.py	65.11% <100.00%> (ø)
djangocms_moderation/cms_toolbars.py	100.00% <100.00%> (ø)
djangocms_moderation/conf.py	100.00% <100.00%> (ø)
...moderation/contrib/moderation_forms/cms_plugins.py	75.00% <100.00%> (ø)
...ocms_moderation/contrib/moderation_forms/models.py	100.00% <100.00%> (ø)
djangocms_moderation/emails.py	82.85% <100.00%> (-0.48%)	:arrow_down:
djangocms_moderation/filters.py	86.11% <100.00%> (ø)
... and 7 more

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