[release] Bump VERSION to 2021.08
[release] Bump VERSION to 2021.08

MasterDuke17/rakudo,salortiz/rakudo,labster/rakudo,rakudo/rakudo,rakudo/rakudo,salortiz/rakudo,salortiz/rakudo,tbrowder/rakudo,rakudo/rakudo,labster/rakudo,tbrowder/rakudo,salortiz/rakudo,rakudo/rakudo,salortiz/rakudo,tbrowder/rakudo,tbrowder/rakudo,tbrowder/rakudo,tbrowder/rakudo,labster/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,labster/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,labster/rakudo,labster/rakudo