fix: switch tseslint's tsconfigRootDir to implicit

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: Lint complaint on new repo with --preset everything: n/no-unsupported-features/node-builtins #2242
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Remove the explicit setting of tsconfigRootDir. Since the corresponding PR in typescript-eslint is now in review, I think it's "soon enough" to make this change in userland. Setting it explicitly is a safety precaution for edge cases.

🎁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.80%. Comparing base (ae26c93) to head (72a7aa0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2245      +/-   ##
==========================================
- Coverage   99.80%   99.80%   -0.01%     
==========================================
  Files         136      136              
  Lines        6111     6110       -1     
  Branches      509      509              
==========================================
- Hits         6099     6098       -1     
  Misses         12       12              

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[github-actions]

🎉 This is included in version v2.46.3 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀