support Python 3.14; drop 3.9

[mr-c]

• support Python 3.14; drop 3.9
• use structural pattern matching

[codecov]

Codecov Report

❌ Patch coverage is 63.28125% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.49%. Comparing base (3df403c) to head (442c7b2).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cwlupgrader/main.py	62.09%	29 Missing and 18 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #194       +/-   ##
===========================================
+ Coverage   57.27%   67.49%   +10.21%     
===========================================
  Files           2        3        +1     
  Lines         529      526        -3     
  Branches      184      176        -8     
===========================================
+ Hits          303      355       +52     
+ Misses        148      111       -37     
+ Partials       78       60       -18     

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