Upgrade TS and configure TS CI accordingly #20477
Merged
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This is a bit more important now that we are officially publishing stable types! Using 4.9 as our initially supported version is an easy choice: it is what we were already using, and it gives us a solid six months of TS releases as our initial support category. Folks may find it useful to review the "rolling windows" policy, since that is Ember's SemVer policy for TS.