Update to SumOfSquares v0.6

[blegat]

Requires

• Fix Symmetry with Sums of Hermitian Squares jump-dev/SumOfSquares.jl#245

Closes #22
Closes #24
Closes #26
Closes #27
Closes #28

[codecov]

Codecov Report

Patch coverage: 37.93% and project coverage change: -35.30 ⚠️

Comparison is base (0a1e8f7) 94.00% compared to head (6c72329) 58.70%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #29       +/-   ##
===========================================
- Coverage   94.00%   58.70%   -35.30%     
===========================================
  Files           7        9        +2     
  Lines         300      465      +165     
===========================================
- Hits          282      273        -9     
- Misses         18      192      +174     

Impacted Files	Coverage Δ
src/CondensedMatterSOS.jl	86.66% <ø> (ø)
src/action.jl	0.00% <0.00%> (ø)
src/sos.jl	0.00% <0.00%> (-94.74%)	⬇️
src/symmetry.jl	0.00% <0.00%> (ø)
src/operators.jl	93.20% <100.00%> (+2.19%)	⬆️
src/types.jl	92.22% <100.00%> (-0.47%)	⬇️

... and 3 files with indirect coverage changes

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