CompatHelper: bump compat for "SimpleGraphs" to "0.7"

[github-actions]

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

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 #212 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   31.78%   31.78%           
=======================================
  Files          43       43           
  Lines        1312     1312           
=======================================
  Hits          417      417           
  Misses        895      895           

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