Action plugin support code: ensure compatibility with newer versions of ansible-core

[felixfontein]

SUMMARY

See ansible/ansible#78860.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/plugin_utils/action_module.py

[codecov]

Codecov Report

Merging #121 (15a757a) into main (797ad9d) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   65.83%   65.80%   -0.04%     
==========================================
  Files          10       10              
  Lines         963      962       -1     
  Branches      230      230              
==========================================
- Hits          634      633       -1     
  Misses        249      249              
  Partials       80       80              

Flag	Coverage Δ
integration	64.99% <50.00%> (-0.04%)	⬇️
sanity	21.72% <0.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
plugins/plugin_utils/action_module.py	45.31% <50.00%> (-0.11%)	⬇️

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[felixfontein]

I explicitly ran the load_vars tests against ansible/ansible#78860 (also ran them once with C.STRING_CONVERSION_ACTION mentioned in the constructor to check that it crashes), and it worked fine.