chore: Add DX as Codeowners #1627

Job	Run time
Test Python 3.13	29s
Test Python 3.10	26s
Test Python 3.14	50s
Test Python 3.8	36s
Test Python 3.9	30s
Test Python 3.12	36s
Test Python 3.11	28s
Smoke test (Python ${{ matrix.python }})	0s
	3m 55s

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