Update actions/checkout action to v4 #180

Job	Run time
people-service-dotnet-scan	40s
trade-processor-dockerfile-scan	1m 45s
database-dockerfile-scan	1m 31s
account-service-dockerfile-scan	1m 45s
account-service-gradle-scan	1m 20s
trade-feed-dockerfile-scan	1m 39s
database-gradle-scan	30s
position-service-dockerfile-scan	1m 40s
position-service-gradle-scan	1m 7s
trade-service-dockerfile-scan	1m 45s
trade-processor-gradle-scan	1m 20s
web-front-end/angular-dockerfile-scan	2m 45s
trade-service-gradle-scan	1m 27s
people-service-dockerfile-scan	1m 32s
reference-data-dockerfile-scan	2m 38s
reference-data-node-scan	1m 6s
trade-feed-node-scan	30s
web-front-end/angular-node-scan	58s
web-front-end/proxy-node-scan	30s
web-front-end/react-node-scan	1m 31s
	27m 59s

Provide feedback