Add v12.21.4 to master's changelog
Add v12.21.4 to master's changelog

A more perm solution to this problem would be nice, but until then we're forward porting changelog entries.

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>
jonlives/chef,Ppjet6/chef,Kast0rTr0y/chef,mal/chef,sanditiffin/chef,martinisoft/chef,Kast0rTr0y/chef,Ppjet6/chef,juliandunn/chef,jaymzh/chef,jonlives/chef,juliandunn/chef,chef/chef,nathwill/chef,Kast0rTr0y/chef,sanditiffin/chef,higanworks/chef,Kast0rTr0y/chef,mattray/chef,Tensibai/chef,Ppjet6/chef,Ppjet6/chef,higanworks/chef,juliandunn/chef,mwrock/chef,martinisoft/chef,chef/chef,MsysTechnologiesllc/chef,mwrock/chef,mattray/chef,tomdoherty/chef,sanditiffin/chef,gene1wood/chef,gene1wood/chef,nvwls/chef,mal/chef,nathwill/chef,jonlives/chef,tas50/chef-1,tomdoherty/chef,Tensibai/chef,nvwls/chef,jaymzh/chef,mattray/chef,tas50/chef-1,martinisoft/chef,Kast0rTr0y/chef,juliandunn/chef,Ppjet6/chef,tas50/chef-1,jaymzh/chef,MsysTechnologiesllc/chef,nvwls/chef,mal/chef,sanditiffin/chef,martinisoft/chef,mwrock/chef,higanworks/chef,martinisoft/chef,tomdoherty/chef,Tensibai/chef,chef/chef,jonlives/chef,jonlives/chef,Kast0rTr0y/chef,higanworks/chef,mal/chef,nvwls/chef,gene1wood/chef,chef/chef,juliandunn/chef,nvwls/chef,mattray/chef,higanworks/chef,nvwls/chef,tas50/chef-1,mattray/chef,mal/chef,gene1wood/chef,jonlives/chef,tomdoherty/chef,mwrock/chef,MsysTechnologiesllc/chef,jaymzh/chef,sanditiffin/chef,Ppjet6/chef,nathwill/chef,nathwill/chef,nathwill/chef,Tensibai/chef,nathwill/chef,tomdoherty/chef,sanditiffin/chef,mal/chef,Tensibai/chef,MsysTechnologiesllc/chef