Moved 'backports.entry_points_selectable' under 'dependencies' since … #422

Job	Run time
Build package	6s
Build package	14s
Static Analysis	7s
Call ci unit tests workflow / Run tests (3.9)	1m 42s
Call ci unit tests workflow / Run tests (3.10)	1m 49s
Call ci unit tests workflow / Run tests (3.11)	1m 50s
	5m 48s

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