update ci to julia 1.7

[codecov[bot]]

Codecov Report

Merging #76 (4039188) into master (30d6fcd) will increase coverage by 0.37%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   94.41%   94.78%   +0.37%     
==========================================
  Files          15       15              
  Lines        1628     1667      +39     
==========================================
+ Hits         1537     1580      +43     
+ Misses         91       87       -4     

Impacted Files	Coverage Δ
src/app/imageclassification/ImageClassification.jl	97.05% <ø> (+0.08%)	:arrow_up:
src/fitness.jl	92.18% <0.00%> (-0.44%)	:arrow_down:
src/app/imageclassification/strategy.jl	91.97% <0.00%> (-0.16%)	:arrow_down:
src/evolve.jl	100.00% <0.00%> (ø)
src/app/imageclassification/archspace.jl	100.00% <0.00%> (ø)
src/crossover.jl	99.39% <0.00%> (+0.02%)	:arrow_up:
src/shape.jl	97.81% <0.00%> (+0.03%)	:arrow_up:
src/util.jl	92.66% <0.00%> (+0.06%)	:arrow_up:
src/candidate.jl	98.30% <0.00%> (+0.07%)	:arrow_up:
... and 4 more

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