don't throw if engines property is a string array

[brettfo]

package.json files seen in the wild have had a string array instead of an object for the engines property (example here). Because of this, anything that pulls in one of these variant packages will fail to generate components.

While engines should be an object, this PR allows for this alternate form to allow detection to continue.

Fixes #1385

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.6%. Comparing base (b6bac81) to head (39de530).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1400   +/-   ##
=====================================
  Coverage   89.6%   89.6%           
=====================================
  Files        401     401           
  Lines      31811   31875   +64     
  Branches    1966    1972    +6     
=====================================
+ Hits       28528   28591   +63     
  Misses      2863    2863           
- Partials     420     421    +1     

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[github-actions]

👋 Hi! It looks like you modified some files in the Detectors folder.
You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂