update github actions to use Julia version 1.7

[BrianGun]

Fixes #353

Pull Request Template

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Test Configuration(s):

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #355 (1006205) into main (b0cc2cc) will increase coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
+ Coverage   52.03%   52.36%   +0.33%     
==========================================
  Files          84       84              
  Lines        8041     7759     -282     
==========================================
- Hits         4184     4063     -121     
+ Misses       3857     3696     -161     

Impacted Files	Coverage Δ
src/RepeatingStructures/HexagonalLattice.jl	47.88% <0.00%> (-2.77%)	⬇️
src/Geometry/Primitives/Curves/BSpline.jl	66.66% <0.00%> (-1.61%)	⬇️
src/OpticSim.jl	87.50% <0.00%> (-1.39%)	⬇️
src/RepeatingStructures/Lattice.jl	20.00% <0.00%> (-0.97%)	⬇️
src/Geometry/Transform.jl	55.34% <0.00%> (-0.83%)	⬇️
src/Geometry/Primitives/AsphericSurface.jl	59.39% <0.00%> (-0.73%)	⬇️
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 50 more

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