fix(IoT): Fixing a potential race condition in the timer ring queue #623

Job	Run time
Unit Test (AWSAPIGateway)	4m 33s
Unit Test (AWSAutoScaling)	4m 49s
Unit Test (AWSCloudWatch)	2m 43s
Unit Test (AWSCognitoAuth)	4m 42s
Unit Test (AWSCognitoIdentityProvider)	6m 1s
Unit Test (AWSComprehend)	3m 43s
Unit Test (AWSConnect)	5m 33s
Unit Test (AWSConnectParticipant)	5m 54s
Unit Test (AWSCore)	10m 42s
Unit Test (AWSDynamoDB)	5m 20s
Unit Test (AWSEC2)	7m 0s
Unit Test (AWSElasticLoadBalancing)	4m 46s
Unit Test (AWSIoT)	4m 33s
Unit Test (AWSKMS)	8m 24s
Unit Test (AWSKinesis)	4m 19s
Unit Test (AWSKinesisVideo)	4m 15s
Unit Test (AWSKinesisVideoArchivedMedia)	6m 23s
Unit Test (AWSKinesisVideoSignaling)	3m 55s
Unit Test (AWSKinesisVideoWebRTCStorage)	5m 28s
Unit Test (AWSLambda)	5m 22s
Unit Test (AWSLex)	4m 41s
Unit Test (AWSLogs)	4m 21s
Unit Test (AWSMachineLearning)	3m 41s
Unit Test (AWSMobileClient)	4m 20s
Unit Test (AWSPinpoint)	4m 46s
Unit Test (AWSPolly)	5m 51s
Unit Test (AWSRekognition)	4m 26s
Unit Test (AWSS3)	4m 45s
Unit Test (AWSSES)	5m 56s
Unit Test (AWSSNS)	4m 38s
Unit Test (AWSSQS)	5m 30s
Unit Test (AWSSageMakerRuntime)	4m 48s
Unit Test (AWSSimpleDB)	6m 38s
Unit Test (AWSTextract)	2m 55s
Unit Test (AWSTranscribe)	3m 51s
Unit Test (AWSTranscribeStreaming)	3m 6s
Unit Test (AWSTranslate)	4m 4s
Unit Test (AWSLocation)	5m 56s
Unit Test (AWSChimeSDKMessaging)	4m 10s
Unit Test (AWSChimeSDKIdentity)	3m 46s
	3h 20m 34s

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