Merge pull request #1474 from emberjs/drop-old-ts

Drop support for TS < 5

Author: NullVoxPopuli

.github/workflows/ci-build.yml

@@ -124,9 +124,6 @@ jobs:
       fail-fast: false
       matrix:
         ts-version:
-          - 4.7
-          - 4.8
-          - 4.9
           - 5.0
           - 5.1
           - 5.2