report: do not expect input and output to be lists

[simleo]

Correctly handle situations like:

"input": {
    "@id": "packed.cwl#revtool.cwl/input"
}

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (4cb3594) 97.61% compared to head (78eb36f) 97.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   97.61%   97.61%           
=======================================
  Files          12       12           
  Lines        1930     1931    +1     
=======================================
+ Hits         1884     1885    +1     
  Misses         46       46           

Files	Coverage Δ
src/runcrate/report.py	96.29% <100.00%> (ø)
tests/test_cli.py	100.00% <100.00%> (ø)

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