Only use spec from node-graph

[superstar54]

Drop support for input_ports and output_ports.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.23711% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.71%. Comparing base (a99283c) to head (b2832e6).

Files with missing lines	Patch %	Lines
src/aiida_pythonjob/utils.py	88.23%	8 Missing ⚠️
src/aiida_pythonjob/parsers/utils.py	92.30%	6 Missing ⚠️
src/aiida_pythonjob/launch.py	85.71%	2 Missing ⚠️
src/aiida_pythonjob/parsers/pythonjob.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   84.06%   78.71%   -5.36%     
==========================================
  Files          20       21       +1     
  Lines        1136     1165      +29     
==========================================
- Hits          955      917      -38     
- Misses        181      248      +67     

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