Replace removed pydicom API

[mrbean-bremen]

• makes it compatible to pydicom 3
• also promote to beta state

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.59%. Comparing base (e8644e2) to head (2f65285).
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
+ Coverage   89.82%   90.59%   +0.76%     
==========================================
  Files          15       15              
  Lines        1632     1722      +90     
==========================================
+ Hits         1466     1560      +94     
+ Misses        166      162       -4     

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