Bump github.com/aws/aws-sdk-go from 1.43.37 to 1.45.12 in /exporter/awsxrayexporter #1451

Job	Run time
setup-environment	17m 40s
stability-test (TestStabilityMetricsOTLP)	51s
stability-test (TestStabilityMetricsOpenCensus)	51s
stability-test (TestStabilityMetricsCarbon)	1m 16s
stability-test (TestStabilityMetricsSignalFx)	1m 28s
stability-test (TestStabilityTracesOpenCensus)	51s
stability-test (TestStabilityTracesSAPM)	59s
stability-test (TestStabilityTracesOTLP)	54s
stability-test (TestStabilityTracesJaegerGRPC)	59s
stability-test (TestStabilityTracesZipkin)	44s
	26m 33s

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