fix: pin skin-tone to ^2.0.0 and add renovate.json ignoreDeps

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🛠 Tooling: Add test that CJS require() works (not just ESM import) #153 (again)
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Continues #154 by pinning the last ESM-only dependency, skin-tone, to its pre-#142 version. See #153 (comment).

I don't know why the CJS test from #154 passed with skin-tone (exports oddity? race condition?) so manually disables the ESM-only dependencies in renove.json. Which is ... most of them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ac996a3) 100.00% compared to head (dcd6c43) 100.00%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #157   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           14        14           
  Lines          263       263           
  Branches        28        28           
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  Hits           263       263           

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