Bump actions/upload-artifact from 3 to 4 #9325

Job	Run time
build	4m 29s
test (v1.28.x, kourier, runtime)	24s
test (v1.28.x, kourier, api)	16s
test (v1.28.x, kourier, e2e)	13s
test (v1.28.x, kourier-tls, runtime)	9s
test (v1.28.x, kourier-tls, api)	14s
test (v1.28.x, kourier-tls, e2e)	9s
test (v1.28.x, istio, runtime)	16s
test (v1.28.x, istio, api)	20s
test (v1.28.x, istio, e2e)	21s
test (v1.28.x, istio-tls, runtime)	15s
test (v1.28.x, istio-tls, api)	27s
test (v1.28.x, istio-tls, e2e)	11s
test (v1.28.x, contour, runtime)	23s
test (v1.28.x, contour, api)	19s
test (v1.28.x, contour, e2e)	11s
test (v1.28.x, gateway_istio, runtime)	14s
test (v1.28.x, gateway_istio, api)	23s
test (v1.28.x, gateway_istio, e2e)	14s
test (v1.28.x, gateway_contour, runtime)	26s
test (v1.28.x, gateway_contour, api)	16s
test (v1.28.x, gateway_contour, e2e)	34s
test (v1.29.x, kourier, runtime)	25s
test (v1.29.x, kourier, api)	10s
test (v1.29.x, kourier, e2e)	32s
test (v1.29.x, kourier-tls, runtime)	9s
test (v1.29.x, kourier-tls, api)	7s
test (v1.29.x, kourier-tls, e2e)	9s
test (v1.29.x, istio, runtime)	16s
test (v1.29.x, istio, api)	8s
test (v1.29.x, istio, e2e)	16s
test (v1.29.x, istio-tls, runtime)	10s
test (v1.29.x, istio-tls, api)	9s
test (v1.29.x, istio-tls, e2e)	13s
test (v1.29.x, contour, runtime)	8s
test (v1.29.x, contour, api)	17s
test (v1.29.x, contour, e2e)	14s
test (v1.29.x, gateway_istio, runtime)	24s
test (v1.29.x, gateway_istio, api)	17s
test (v1.29.x, gateway_istio, e2e)	14s
test (v1.29.x, gateway_contour, runtime)	8s
test (v1.29.x, gateway_contour, api)	15s
test (v1.29.x, gateway_contour, e2e)	11s
	15m 36s

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