add `3pk`

[tmigot]

https://github.com/mpf/Optimization-Test-Problems/blob/master/cute/3pk.mod

[codecov[bot]]

Codecov Report

Base: 99.86% // Head: 99.86% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (9c15739) compared to base (60b2107). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #207    +/-   ##
========================================
  Coverage   99.86%   99.86%            
========================================
  Files         751      754     +3     
  Lines        6731     6856   +125     
========================================
+ Hits         6722     6847   +125     
  Misses          9        9            

Impacted Files	Coverage Δ
src/ADNLPProblems/threepk.jl	100.00% <100.00%> (ø)
src/Meta/threepk.jl	100.00% <100.00%> (ø)
src/PureJuMP/threepk.jl	100.00% <100.00%> (ø)

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