fix: update release information for v3.21.0

[konradlang]

Description:

Please provide a short description of what this PR is supposed to accomplish...

Checklist:

• I have updated the documentation in all relevant places (Javadoc, Swagger, MDs...)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.90%. Comparing base (05ef928) to head (6aecc09).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1146   +/-   ##
=========================================
  Coverage     85.90%   85.90%           
  Complexity     2251     2251           
=========================================
  Files           282      282           
  Lines          6263     6263           
  Branches        390      390           
=========================================
  Hits           5380     5380           
  Misses          636      636           
  Partials        247      247           

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[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

[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