Bump gopkg.in/DataDog/dd-trace-go.v1 from 1.37.1 to 1.54.1 in /exporter/datadogexporter #1282

Job	Run time
setup-environment	15m 51s
stability-test (TestStabilityMetricsOTLP)	3m 29s
stability-test (TestStabilityMetricsOpenCensus)	57s
stability-test (TestStabilityMetricsCarbon)	1m 13s
stability-test (TestStabilityMetricsSignalFx)	3m 24s
stability-test (TestStabilityTracesOpenCensus)	58s
stability-test (TestStabilityTracesSAPM)	54s
stability-test (TestStabilityTracesOTLP)	54s
stability-test (TestStabilityTracesJaegerGRPC)	1m 27s
stability-test (TestStabilityTracesZipkin)	59s
	30m 6s

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