e57367 groups.d/231.native_packages_etc.d/expat.package: bump to v2.6.4

Authored and Committed by Redfoxmoon a week ago
    groups.d/231.native_packages_etc.d/expat.package: bump to v2.6.4
    
    Signed-off-by: Ørjan Malde <red@foxi.me>