Use fetch from auth

[rogebrd]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• SDK Code Change
• Example/Test Code Change

Validation

• Does npm test pass?
• Does npm run build pass?
• Does npm run lint pass?

[codecov]

Codecov Report

Merging #929 (f1aa5d0) into main (1305318) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
- Coverage   65.86%   65.86%   -0.01%     
==========================================
  Files           7        7              
  Lines         791      788       -3     
==========================================
- Hits          521      519       -2     
+ Misses        270      269       -1     

Flag	Coverage Δ
integration	53.42% <100.00%> (-0.06%)	⬇️
unit	64.84% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/dropbox.js	100.00% <100.00%> (+1.33%)	⬆️

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[sderickson]

LGTM!