CompatHelper: bump compat for FastGaussQuadrature to 0.5, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the FastGaussQuadrature package from 0.4 to 0.4, 0.5.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov-commenter]

Codecov Report

Merging #51 (6d756bc) into master (1aa5681) will decrease coverage by 0.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage   57.05%   56.65%   -0.41%     
==========================================
  Files          88       88              
  Lines        7033     6548     -485     
==========================================
- Hits         4013     3710     -303     
+ Misses       3020     2838     -182     

Impacted Files	Coverage Δ
src/MCIntegration/utility/color.jl	15.38% <0.00%> (-9.62%)	⬇️
src/FeynmanDiagram/diagram_tree/common.jl	50.00% <0.00%> (-5.56%)	⬇️
src/FeynmanDiagram/expression_tree/eval.jl	65.78% <0.00%> (-2.51%)	⬇️
src/Lehmann/discrete/builder.jl	66.66% <0.00%> (-2.26%)	⬇️
src/MCIntegration/vegas/montecarlo.jl	86.95% <0.00%> (-2.14%)	⬇️
src/FeynmanDiagram/common.jl	60.95% <0.00%> (-2.12%)	⬇️
src/FeynmanDiagram/expression_tree/tree.jl	66.66% <0.00%> (-1.76%)	⬇️
...Diagram/parquet_builder/benchmark/diagram_count.jl	55.69% <0.00%> (-1.63%)	⬇️
src/GreenFunc/meshgrids/common.jl	62.06% <0.00%> (-1.27%)	⬇️
src/MCIntegration/vegas_mc/updates.jl	90.00% <0.00%> (-1.18%)	⬇️
... and 64 more

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