fix(Pinpoint): Fixing error decoding `AWSPinpointEndpointProfile` when attributes are set. #590

Job	Run time
Unit Test (AWSAPIGateway)	4m 3s
Unit Test (AWSAutoScaling)	5m 29s
Unit Test (AWSCloudWatch)	3m 26s
Unit Test (AWSCognitoAuth)	2m 39s
Unit Test (AWSCognitoIdentityProvider)	4m 49s
Unit Test (AWSComprehend)	3m 26s
Unit Test (AWSConnect)	3m 34s
Unit Test (AWSConnectParticipant)	3m 10s
Unit Test (AWSCore)	7m 18s
Unit Test (AWSDynamoDB)	3m 21s
Unit Test (AWSEC2)	4m 31s
Unit Test (AWSElasticLoadBalancing)	3m 21s
Unit Test (AWSIoT)	4m 22s
Unit Test (AWSKMS)	4m 37s
Unit Test (AWSKinesis)	3m 7s
Unit Test (AWSKinesisVideo)	6m 7s
Unit Test (AWSKinesisVideoArchivedMedia)	3m 24s
Unit Test (AWSKinesisVideoSignaling)	6m 17s
Unit Test (AWSKinesisVideoWebRTCStorage)	3m 2s
Unit Test (AWSLambda)	4m 53s
Unit Test (AWSLex)	3m 48s
Unit Test (AWSLogs)	3m 30s
Unit Test (AWSMachineLearning)	3m 13s
Unit Test (AWSMobileClient)	3m 31s
Unit Test (AWSPinpoint)	4m 25s
Unit Test (AWSPolly)	2m 58s
Unit Test (AWSRekognition)	3m 18s
Unit Test (AWSS3)	5m 17s
Unit Test (AWSSES)	3m 13s
Unit Test (AWSSNS)	3m 26s
Unit Test (AWSSQS)	3m 17s
Unit Test (AWSSageMakerRuntime)	3m 0s
Unit Test (AWSSimpleDB)	3m 6s
Unit Test (AWSTextract)	3m 52s
Unit Test (AWSTranscribe)	3m 16s
Unit Test (AWSTranscribeStreaming)	3m 45s
Unit Test (AWSTranslate)	3m 33s
Unit Test (AWSLocation)	4m 35s
Unit Test (AWSChimeSDKMessaging)	5m 20s
Unit Test (AWSChimeSDKIdentity)	5m 47s
	2h 41m 6s

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