Upgrade to latest django / django CMS

[yakky]

Description

• Upgrade to Django 3.2+
• Upgrade to django CMS 3.9+
• Remove support for aldryn-search
• Upgrade github actions

References

Fix #720

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[codecov]

Codecov Report

Patch coverage: 94.73% and project coverage change: -0.27 ⚠️

Comparison is base (4647c47) 94.51% compared to head (ee71cd1) 94.25%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #722      +/-   ##
===========================================
- Coverage    94.51%   94.25%   -0.27%     
===========================================
  Files           21       26       +5     
  Lines         1112     1810     +698     
  Branches       138      260     +122     
===========================================
+ Hits          1051     1706     +655     
- Misses          23       52      +29     
- Partials        38       52      +14     

Flag	Coverage Δ
unittests	94.25% <94.73%> (-0.27%)	⬇️

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

Impacted Files	Coverage Δ
djangocms_blog/cms_wizards.py	95.65% <ø> (ø)
djangocms_blog/taggit_urls.py	0.00% <0.00%> (ø)
djangocms_blog/__init__.py	100.00% <100.00%> (ø)
djangocms_blog/admin.py	83.06% <100.00%> (ø)
djangocms_blog/feeds.py	85.03% <100.00%> (ø)
djangocms_blog/liveblog/cms_plugins.py	95.23% <100.00%> (-4.77%)	⬇️
djangocms_blog/liveblog/consumers.py	100.00% <100.00%> (ø)
djangocms_blog/liveblog/models.py	96.55% <100.00%> (+0.06%)	⬆️
djangocms_blog/liveblog/routing.py	100.00% <100.00%> (ø)

... and 7 files with indirect coverage changes

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[yakky]

Fix #721