chore!: Drop Ruby 2.7 and 3.0, add Ruby 3.3

[maxveldink]

This PR

Since Ruby 2.7 and 3.3 are both older than three years now, we should consider dropping support and targeting N-2 (since Ruby 3.3 is so new and a few known issues are being fixed in the next patch version of 3.3). I also added a .tool-versions file as an optional change for easier ASDF support, but can remove that if we'd like.

Follow-up Tasks

This will need to be released in a major version bump.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (dc36974) 98.90% compared to head (70382d2) 98.90%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #91 +/- ## ======================================= Coverage 98.90% 98.90% ======================================= Files 6 6 Lines 91 91 ======================================= Hits 90 90 Misses 1 1 ```

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