avoid set-output command deprecated #1845

Job	Run time
evolution (ubuntu-latest, 3.9)	1m 55s
tracking-methods (ubuntu-latest, 3.11)	1m 29s
evolution (ubuntu-latest, 3.11)	1m 42s
tracking-methods (macos-14, 3.11)	1m 7s
export-reid-models	2m 39s
mot-metrics-benchmark (ubuntu-latest, 3.9)	2m 10s
mot-metrics-benchmark (ubuntu-latest, 3.11)	2m 2s
tests	2m 1s
tracking-with-pose	1m 21s
tracking-with-seg	1m 9s
tracking-with-yolos	1m 9s
check-failures	1s
	18m 45s

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