Bump otel dependencies to v0.115.0/v1.21.0 #1031

Job	Run time
collector-build	8m 52s
docker-build	8m 57s
supervisor-test	52s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 30s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 23s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 2s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 15s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 41s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 29s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 16s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 5s
kubernetes-test	1s
	59m 23s

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