chore: fix broken URL on Windows (#3304) (CP: 24.7)

[vaadin-bot]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.89%. Comparing base (4364521) to head (281c58a).
Report is 1 commits behind head on 24.7.

Additional details and impacted files

@@           Coverage Diff           @@
##             24.7    #3305   +/-   ##
=======================================
  Coverage   86.89%   86.89%           
=======================================
  Files         115      115           
  Lines        8300     8300           
  Branches     1269     1269           
=======================================
  Hits         7212     7212           
  Misses       1074     1074           
  Partials       14       14           

Flag	Coverage Δ
unittests	86.89% <ø> (ø)

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