chore: Updated Undici tests to cover version 8

[jsumners-nr]

This PR updates the versioned tests configuration for undici such that it is run on the correct Node.js + undici versions.

Related: nodejs/undici#5024

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.70%. Comparing base (ff677a2) to head (a6c5285).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3896      +/-   ##
==========================================
- Coverage   97.81%   97.70%   -0.12%     
==========================================
  Files         491      491              
  Lines       59709    59709              
  Branches        1        1              
==========================================
- Hits        58405    58338      -67     
- Misses       1304     1371      +67     

Flag	Coverage Δ
integration-tests-cjs-20.x	74.27% <ø> (ø)
integration-tests-cjs-22.x	74.49% <ø> (ø)
integration-tests-cjs-24.x	75.14% <ø> (+<0.01%)	⬆️
integration-tests-esm-20.x	53.64% <ø> (ø)
integration-tests-esm-22.x	53.68% <ø> (ø)
integration-tests-esm-24.x	54.88% <ø> (ø)
unit-tests-20.x	89.77% <ø> (+<0.01%)	⬆️
unit-tests-22.x	89.79% <ø> (ø)
unit-tests-24.x	89.79% <ø> (ø)
versioned-tests-20.x	80.81% <ø> (-0.24%)	⬇️
versioned-tests-22.x	80.82% <ø> (-0.24%)	⬇️
versioned-tests-24.x	80.72% <ø> (-0.24%)	⬇️

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