chore: attribute exit code 127 as a missing executable

[dgandhi62]

When a command run through shell() exits with code 127, report it as a missing/unavailable executable instead of a bare exited with error code 127.

• This change contains a major version upgrade for a dependency and I confirm all breaking changes are addressed
  • Release notes for the new version:

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.64%. Comparing base (00fb6f6) to head (ca49d9d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1998      +/-   ##
==========================================
- Coverage   91.67%   91.64%   -0.03%     
==========================================
  Files          82       82              
  Lines       13039    13039              
  Branches     1825     1824       -1     
==========================================
- Hits        11953    11950       -3     
- Misses       1048     1051       +3     
  Partials       38       38              

Flag	Coverage Δ
suite.unit	91.64% <ø> (-0.03%)	⬇️

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