CompatHelper: bump compat for XLSX to 0.9, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the XLSX package from 0.7, 0.8 to 0.7, 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-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 :tada:

Comparison is base (6fbe606) 73.52% compared to head (12ed5de) 73.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #34 +/- ## ========================================== + Coverage 73.52% 73.56% +0.04% ========================================== Files 34 34 Lines 1133 1135 +2 ========================================== + Hits 833 835 +2 Misses 300 300 ``` | [Impacted Files](https://codecov.io/gh/VEZY/MultiScaleTreeGraph.jl/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy) | Coverage Δ | | |---|---|---| | [src/compute\_MTG/transform.jl](https://codecov.io/gh/VEZY/MultiScaleTreeGraph.jl/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy#diff-c3JjL2NvbXB1dGVfTVRHL3RyYW5zZm9ybS5qbA==) | `84.61% <ø> (-0.39%)` | :arrow_down: | | [src/compute\_MTG/node\_funs.jl](https://codecov.io/gh/VEZY/MultiScaleTreeGraph.jl/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy#diff-c3JjL2NvbXB1dGVfTVRHL25vZGVfZnVucy5qbA==) | `53.48% <100.00%> (+2.26%)` | :arrow_up: | | [src/compute\_MTG/summary.jl](https://codecov.io/gh/VEZY/MultiScaleTreeGraph.jl/pull/34?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy#diff-c3JjL2NvbXB1dGVfTVRHL3N1bW1hcnkuamw=) | `81.81% <100.00%> (+0.42%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=R%C3%A9mi+Vezy)

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