Error on convergence termination criterion when multi-objective problem

[jmejia8]

Argmax will fail in some cases: multiobjective scenarios

https://github.com/jmejia8/Metaheuristics.jl/blob/c3d0c808e6d87e5b39747572fad9e0b6d3f60c37/src/termination/convergence.jl#L89C13-L89C13