Bump github.com/aws/aws-sdk-go from 1.43.37 to 1.45.12 in /exporter/awsprometheusremotewriteexporter #1304

Job	Run time
setup-environment	14m 7s
stability-test (TestStabilityMetricsOTLP)	45s
stability-test (TestStabilityMetricsOpenCensus)	51s
stability-test (TestStabilityMetricsCarbon)	44s
stability-test (TestStabilityMetricsSignalFx)	44s
stability-test (TestStabilityTracesOpenCensus)	1m 9s
stability-test (TestStabilityTracesSAPM)	1m 30s
stability-test (TestStabilityTracesOTLP)	52s
stability-test (TestStabilityTracesJaegerGRPC)	1m 2s
stability-test (TestStabilityTracesZipkin)	59s
	22m 43s

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