Update dependency System.Text.Json to v6.0.9 #145

Job	Run time
people-service-dotnet-scan	41s
trade-processor-dockerfile-scan	1m 45s
database-dockerfile-scan	1m 26s
account-service-gradle-scan	1m 13s
reference-data-node-scan	54s
account-service-dockerfile-scan	1m 42s
trade-feed-node-scan	38s
database-gradle-scan	38s
trade-feed-dockerfile-scan	1m 39s
web-front-end/angular-node-scan	1m 0s
position-service-gradle-scan	1m 6s
position-service-dockerfile-scan	1m 56s
web-front-end/proxy-node-scan	35s
trade-processor-gradle-scan	1m 36s
trade-service-dockerfile-scan	1m 50s
web-front-end/angular-dockerfile-scan	2m 45s
web-front-end/react-node-scan	1m 33s
trade-service-gradle-scan	1m 8s
people-service-dockerfile-scan	1m 30s
reference-data-dockerfile-scan	2m 32s
	28m 7s

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