New pdfchecker URL - Fix #1100

[andersonhc]

e.g. Fixes #0

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (718c7ce) 93.49% compared to head (ff4f246) 93.50%.
Report is 2 commits behind head on master.

❗ Current head ff4f246 differs from pull request most recent head 00c557a. Consider uploading reports for the commit 00c557a to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1101   +/-   ##
=======================================
  Coverage   93.49%   93.50%           
=======================================
  Files          29       29           
  Lines        8553     8556    +3     
  Branches     1577     1577           
=======================================
+ Hits         7997     8000    +3     
  Misses        344      344           
  Partials      212      212           

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