chore: Update release flow and drop python 3.7

[marksweb]

No description provided.

[codecov]

Codecov Report

Merging #157 (417ea38) into master (d4836f4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #157   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           71        71           
  Lines         1214      1214           
  Branches       156       156           
=========================================
  Hits          1214      1214           

Impacted Files	Coverage Δ
...s_bootstrap4/contrib/bootstrap4_carousel/models.py	100.00% <ø> (ø)
...contrib/bootstrap4_grid/migrations/0001_initial.py	100.00% <ø> (ø)
...contrib/bootstrap4_card/migrations/0001_initial.py	100.00% <100.00%> (ø)
...gocms_bootstrap4/contrib/bootstrap4_card/models.py	100.00% <100.00%> (ø)
...rib/bootstrap4_carousel/migrations/0001_initial.py	100.00% <100.00%> (ø)
...tstrap4/contrib/bootstrap4_collapse/cms_plugins.py	100.00% <100.00%> (ø)
..._bootstrap4/contrib/bootstrap4_grid/cms_plugins.py	100.00% <100.00%> (ø)
...gocms_bootstrap4/contrib/bootstrap4_grid/models.py	100.00% <100.00%> (ø)
...trib/bootstrap4_picture/migrations/0001_initial.py	100.00% <100.00%> (ø)
...contrib/bootstrap4_tabs/migrations/0001_initial.py	100.00% <100.00%> (ø)
... and 3 more

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