CompatHelper: bump compat for "Distances" to "0.9"

[github-actions]

This pull request changes the compat entry for the Distances package from 0.8 to 0.8, 0.9.

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]

Codecov Report

Merging #20 into master will decrease coverage by 0.68%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   93.70%   93.01%   -0.69%     
==========================================
  Files          10       10              
  Lines         270      272       +2     
==========================================
  Hits          253      253              
- Misses         17       19       +2     

Impacted Files	Coverage Δ
src/knn_graph/abstract.jl	16.66% <0.00%> (-3.34%)	⬇️
src/knn_graph/heap_graph.jl	97.01% <0.00%> (-1.47%)	⬇️

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