Prevent regressions when upgrading pdfjs-dist

[make-github-pseudonymous-again]

Fixes #683.

[codecov]

Codecov Report

Attention: Patch coverage is 92.75362% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 65.85%. Comparing base (ea92e65) to head (02e9cba).

Files	Patch %	Lines
imports/lib/blob/blobToDataURL.ts	80.00%	3 Missing and 1 partial ⚠️
imports/lib/blob/blobToImage.ts	75.00%	3 Missing ⚠️
imports/lib/pdf/pdfthumbnails.ts	62.50%	0 Missing and 3 partials ⚠️
server/polyfill/fetch.ts	62.50%	1 Missing and 2 partials ⚠️
imports/_test/fixtures.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #937      +/-   ##
==========================================
+ Coverage   64.46%   65.85%   +1.39%     
==========================================
  Files         703      715      +12     
  Lines        9705     9893     +188     
  Branches     1335     1346      +11     
==========================================
+ Hits         6256     6515     +259     
+ Misses       3003     2919      -84     
- Partials      446      459      +13     

Flag	Coverage Δ
test	72.10% <91.78%> (+2.33%)	⬆️
test-app	53.70% <41.86%> (-0.03%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.