Update CI.yml

[BrianGun]

Added Julia 1.7.0-rc3 to set of versions to run CI against.

We will switch to 1.7 soon so we should start testing against the latest release candidate.

[codecov-commenter]

Codecov Report

Merging #324 (a139e0f) into main (de21af9) will increase coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #324      +/-   ##
==========================================
+ Coverage   54.74%   55.11%   +0.36%     
==========================================
  Files          79       79              
  Lines        7531     7267     -264     
==========================================
- Hits         4123     4005     -118     
+ Misses       3408     3262     -146     

Impacted Files	Coverage Δ
src/RepeatingStructures/HexagonalLattice.jl	47.88% <0.00%> (-2.77%)	⬇️
src/RepeatingStructures/Lattice.jl	78.57% <0.00%> (-2.68%)	⬇️
src/Geometry/Primitives/Curves/BSpline.jl	66.66% <0.00%> (-1.61%)	⬇️
src/OpticSim.jl	87.50% <0.00%> (-1.39%)	⬇️
src/Geometry/Transform.jl	53.37% <0.00%> (-0.93%)	⬇️
src/Geometry/Primitives/AsphericSurface.jl	59.14% <0.00%> (-0.74%)	⬇️
src/Geometry/Primitives/Curves/Knots.jl	92.30% <0.00%> (-0.72%)	⬇️
src/GlassCat/generate.jl	89.58% <0.00%> (-0.62%)	⬇️
src/Geometry/CSG/CSG.jl	83.76% <0.00%> (-0.47%)	⬇️
src/GlassCat/GlassTypes.jl	43.33% <0.00%> (-0.32%)	⬇️
... and 46 more

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