fix `activesupport (~> 7.0)` being EOL

[jkowalleck]

~> 7.2

Previous are EOL

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@pboling

I'll be adding discrete support for testing against different versions of dependencies when I add appraisals in a different PR, and I'll also take that opportunity to rip out the active support dependency completely. It's way too much for this PR though.

Originally posted by @seuros in #38 (comment)

[pboling]

I think the title here should have rails instead of ruby