DO NOT MERGE Fix OpenSSF Scorecard badge link in README

[nginx-bot]

Updated OpenSSF Scorecard badge link to new URL.

Proposed changes

Fix OpenSSF Scorecard badge link in README.md that is now going to a json file, after this patch it will work as it should

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.83%. Comparing base (c15ff6d) to head (c25374e).
⚠️ Report is 181 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9408      +/-   ##
==========================================
+ Coverage   53.95%   54.83%   +0.87%     
==========================================
  Files          91       98       +7     
  Lines       18692    19647     +955     
==========================================
+ Hits        10086    10773     +687     
- Misses       8075     8253     +178     
- Partials      531      621      +90     

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