Bump Istio to 1.19.3 #8989

Job	Run time
e2e tests (v1.26.x, ./test/conformance, latest, no-mesh)	12m 49s
e2e tests (v1.26.x, ./test/conformance, latest, ambient)	10m 42s
e2e tests (v1.26.x, ./test/e2e, latest, no-mesh)	13m 30s
e2e tests (v1.26.x, ./test/e2e, latest, ambient)	14m 20s
e2e tests (v1.27.x, ./test/conformance, latest, no-mesh)	10m 6s
e2e tests (v1.27.x, ./test/conformance, latest, ambient)	11m 26s
e2e tests (v1.27.x, ./test/e2e, latest, no-mesh)	11m 53s
e2e tests (v1.27.x, ./test/e2e, latest, ambient)	10m 33s
e2e tests (v1.28.x, ./test/conformance, latest, no-mesh)	11m 40s
e2e tests (v1.28.x, ./test/conformance, latest, ambient)	11m 48s
e2e tests (v1.28.x, ./test/e2e, latest, no-mesh)	11m 59s
e2e tests (v1.28.x, ./test/e2e, latest, ambient)	11m 56s
	2h 22m 42s

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