Fixes release date for v0.21.0 on CHANGELOG.md

[pedropaulosuzuki]

No description provided.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,598	52,598	0
Passed	49,421	49,421	0
Ignored	2,134	2,134	0
Failed	1,043	1,043	0
Panics	0	0	0
Conformance	93.96%	93.96%	0.00%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.71%. Comparing base (6ddc2b4) to head (74e62fc).
⚠️ Report is 628 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4583       +/-   ##
===========================================
+ Coverage   47.24%   57.71%   +10.47%     
===========================================
  Files         476      531       +55     
  Lines       46892    58729    +11837     
===========================================
+ Hits        22154    33898    +11744     
- Misses      24738    24831       +93     

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[nekevss]

Thanks for the contribution!