docs(README): Update sponsor list

[gofeatureflag-bot]

Automated pull request to update readme with the sponsor list

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	a80ca1e
🔍 Latest deploy log	https://app.netlify.com/projects/go-feature-flag-doc-preview/deploys/690628fca3e7c40008cff9c5

[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 84.96%. Comparing base (53bd1cf) to head (a80ca1e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4202      +/-   ##
==========================================
- Coverage   84.98%   84.96%   -0.02%     
==========================================
  Files         140      140              
  Lines        5660     5660              
==========================================
- Hits         4810     4809       -1     
  Misses        644      644              
- Partials      206      207       +1     

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