CompatHelper: bump compat for ModelingToolkit to 9 for package downstream, (keep existing compat)#1

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compathelper/new_version/2024-02-22-07-08-17-358-01113895804jlchan/RecursiveArrayTools.jl:compathelper/new_version/2024-02-22-07-08-17-358-01113895804Copy head branch name to clipboard