Replaced eigvals with subset_by_index #3722

Job	Run time
docs	4m 33s
licenses	47s
build (ubuntu-latest, 3.8, 1.10.15)	38m 25s
code-quality	3m 46s
build (ubuntu-latest, 3.8, 2.7.1)	39m 16s
optional_dependencies (default)	51s
optional_dependencies (tensorflow)	1m 22s
optional_dependencies (torch)	2m 3s
optional_dependencies (prophet)	51s
build (ubuntu-latest, 3.9, 1.10.15)	38m 18s
optional_dependencies (keops)	2m 10s
build (ubuntu-latest, 3.9, 2.7.1)	39m 10s
optional_dependencies (all)	2m 43s
build (ubuntu-latest, 3.10, 1.10.15)	39m 5s
build (ubuntu-latest, 3.10, 2.7.1)	39m 46s
build (ubuntu-latest, 3.11, 1.10.15)	39m 53s
build (ubuntu-latest, 3.11, 2.7.1)	38m 51s
build (windows-latest, 3.10, 1.10.15)	43m 51s
build (windows-latest, 3.10, 2.7.1)	46m 18s
	7h 1m 59s

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