Update actions/checkout action to v4 #195

Job	Run time
trade-processor-dockerfile-scan	1m 52s
database-dockerfile-scan	1m 27s
people-service-dotnet-scan	1m 3s
account-service-dockerfile-scan	1m 41s
account-service-gradle-scan	1m 29s
trade-feed-dockerfile-scan	1m 46s
database-gradle-scan	41s
position-service-dockerfile-scan	1m 39s
position-service-gradle-scan	1m 22s
reference-data-node-scan	50s
trade-service-dockerfile-scan	1m 41s
trade-processor-gradle-scan	1m 22s
trade-feed-node-scan	32s
web-front-end/angular-dockerfile-scan	2m 36s
trade-service-gradle-scan	1m 35s
web-front-end/angular-node-scan	1m 0s
people-service-dockerfile-scan	1m 26s
web-front-end/proxy-node-scan	30s
reference-data-dockerfile-scan	2m 29s
web-front-end/react-node-scan	1m 28s
	28m 29s

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