Bump k8s.io/client-go from 0.23.5 to 0.28.2 in /processor/k8sattributesprocessor #1435

Job	Run time
setup-environment	9m 57s
stability-test (TestStabilityMetricsOTLP)	52s
stability-test (TestStabilityMetricsOpenCensus)	1m 1s
stability-test (TestStabilityMetricsCarbon)	51s
stability-test (TestStabilityMetricsSignalFx)	1m 3s
stability-test (TestStabilityTracesOpenCensus)	58s
stability-test (TestStabilityTracesSAPM)	53s
stability-test (TestStabilityTracesOTLP)	1m 6s
stability-test (TestStabilityTracesJaegerGRPC)	50s
stability-test (TestStabilityTracesZipkin)	58s
	18m 29s

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