Fix downloads count badge

[pricklypointer]

Fixed the download count badge using https://juliapkgstats.com/. The current badge is broken because the old API and PkgVisBoard is not maintained.

This PR:

• Replaces the broken badge with a new badge that uses the new API

Please review and provide any feedback. Thanks for considering this PR!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (ae99e73) to head (d177f31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   99.75%   94.66%   -5.10%     
==========================================
  Files          36       36              
  Lines        2078     2060      -18     
==========================================
- Hits         2073     1950     -123     
- Misses          5      110     +105     

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

[t-bltg]

Awesome, thanks 😎.