Changed Color palette name in theme.json (Used base, base-2, contrast , contrast-2, contrast-3, accent, accent-2 Instead of particular color name for Reuse name in custom style variation)
Added Font License Info in readme.txt
Changed required php version in style.css (added 7.4 same as readme.txt)
Changed Tested Up to 6.6 in style.css & readme.txt (Because we are already in 6.6 RC1 was already released)