packaging: restore Python 3.8 and 3.9

[Guts]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.66%. Comparing base (da3b135) to head (541384d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   80.48%   80.66%   +0.17%     
==========================================
  Files           9       10       +1     
  Lines         615      631      +16     
  Branches      128      131       +3     
==========================================
+ Hits          495      509      +14     
- Misses         83       84       +1     
- Partials       37       38       +1     

Flag	Coverage Δ
unittests	80.50% <93.61%> (+0.01%)	⬆️

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

Files	Coverage Δ
mkdocs_rss_plugin/__about__.py	100.00% <ø> (ø)
mkdocs_rss_plugin/config.py	100.00% <100.00%> (ø)
...lugin/integrations/theme_material_social_plugin.py	76.61% <100.00%> (+0.19%)	⬆️
mkdocs_rss_plugin/models.py	100.00% <100.00%> (ø)
mkdocs_rss_plugin/plugin.py	90.07% <100.00%> (+0.07%)	⬆️
mkdocs_rss_plugin/timezoner.py	83.33% <ø> (ø)
mkdocs_rss_plugin/util.py	73.74% <100.00%> (+0.30%)	⬆️
mkdocs_rss_plugin/timezoner_pre39.py	83.33% <83.33%> (ø)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud