Use Test::Needs in t/locally-defined-sub.t

[oalders]

• Reformat yaml
• Test on 5.40
• Use Test::Needs in t/locally-defined-sub.t

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (ef29ab6) to head (e1c9021).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
+ Coverage   87.41%   87.52%   +0.11%     
==========================================
  Files           9        9              
  Lines         866      866              
  Branches      196      196              
==========================================
+ Hits          757      758       +1     
  Misses         82       82              
+ Partials       27       26       -1     

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