Bump to Julia 1.6

[codecov[bot]]

Codecov Report

Merging #71 (97c6d4e) into main (a10816b) will decrease coverage by 0.08%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   94.75%   94.66%   -0.09%     
==========================================
  Files         151      151              
  Lines        1486     1481       -5     
==========================================
- Hits         1408     1402       -6     
- Misses         78       79       +1     

Impacted Files	Coverage Δ
src/NLSProblems.jl	0.00% <0.00%> (-100.00%)	:arrow_down:

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[dpo]

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