Bump nodejs from v2.11.0 to v2.12.0 in helm-charts/splunk-otel-collector/values.yaml #1505

Job	Run time
kubernetes-test (v1.30.0, functional)	7m 34s
kubernetes-test (v1.30.0, histogram)	3m 37s
kubernetes-test (v1.29.0, functional)	10m 52s
kubernetes-test (v1.29.0, histogram)	4m 13s
kubernetes-test (v1.28.0, functional)	8m 3s
kubernetes-test (v1.28.0, histogram)	4m 0s
kubernetes-test (v1.27.3, functional)	8m 1s
kubernetes-test (v1.27.3, histogram)	3m 58s
kubernetes-test (v1.26.6, functional)	8m 8s
kubernetes-test (v1.26.6, histogram)	3m 39s
kubernetes-test (v1.25.11, functional)	7m 51s
kubernetes-test (v1.25.11, histogram)	3m 58s
Test helm install in EKS - credentials needed	0s
Test helm upgrade in GKE/Autopilot - credentials needed	0s
Test helm upgrade in EKS - credentials needed	0s
Test helm install in GKE/Autopilot - credentials needed	0s
Test helm install in AKS - credentials needed	0s
	1h 13m 54s

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