fix: construction of inflight request key

[jimmythomson]

Now takes in to consideration the Authorization and X-External-User-ID headers when building up the key.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.23%. Comparing base (ce988b0) to head (9c590f9).
⚠️ Report is 1 commits behind head on main.

❌ Your project check has failed because the head coverage (94.23%) is below the target coverage (99.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   94.12%   94.23%   +0.10%     
==========================================
  Files          58       58              
  Lines        1447     1456       +9     
  Branches      145      148       +3     
==========================================
+ Hits         1362     1372      +10     
  Misses         68       68              
+ Partials       17       16       -1     

Files with missing lines	Coverage Δ
src/lib/request/request.ts	100.00% <100.00%> (+1.29%)	⬆️

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[github-actions]

🎉 This PR is included in version 6.27.1 🎉

The release is available on:

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

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