Add CI tests for Python 3.12

[mrbean-bremen]

• fix issue links in release notes
• add dependabot config for GH actions
• make sure the selected DICOM version is used for tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8971fff) 89.31% compared to head (d5be246) 89.31%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   89.31%   89.31%           
=======================================
  Files          14       14           
  Lines        1554     1554           
=======================================
  Hits         1388     1388           
  Misses        166      166           

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