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

[github-actions[bot]]

This pull request changes the compat entry for the BenchmarkTools package from ^0.4.3, 0.5, 0.6 to ^0.4.3, 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.