CompatHelper: bump compat for "MeasureTheory" to "0.8"

[github-actions]

This pull request changes the compat entry for the MeasureTheory package from 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 to 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8.

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 #81 (642dc72) into main (303105d) will decrease coverage by 3.37%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   90.42%   87.05%   -3.38%     
==========================================
  Files           8        8              
  Lines         512      587      +75     
==========================================
+ Hits          463      511      +48     
- Misses         49       76      +27     

Impacted Files	Coverage Δ
src/regression.jl	84.72% <0.00%> (-10.60%)	⬇️
src/types.jl	82.50% <40.00%> (+0.22%)	⬆️
src/guiding.jl	82.46% <69.23%> (-10.47%)	⬇️
src/filter.jl	94.26% <100.00%> (ø)
src/sample.jl	100.00% <100.00%> (ø)
src/utils.jl	72.50% <100.00%> (+6.87%)	⬆️
src/solver.jl	84.61% <0.00%> (+2.56%)	⬆️

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