Update ag-grid monorepo to v31 #343

Job	Run time
trade-processor-dockerfile-scan	1m 49s
people-service-dotnet-scan	48s
database-dockerfile-scan	1m 27s
account-service-gradle-scan	57s
account-service-dockerfile-scan	2m 1s
database-gradle-scan	49s
reference-data-node-scan	52s
trade-feed-dockerfile-scan	1m 40s
position-service-gradle-scan	1m 15s
trade-feed-node-scan	31s
position-service-dockerfile-scan	1m 44s
trade-processor-gradle-scan	1m 13s
web-front-end/angular-node-scan	1m 8s
trade-service-dockerfile-scan	1m 42s
trade-service-gradle-scan	2m 34s
web-front-end/proxy-node-scan	30s
web-front-end/angular-dockerfile-scan	2m 39s
people-service-dockerfile-scan	1m 36s
web-front-end/react-node-scan	1m 34s
reference-data-dockerfile-scan	3m 32s
	30m 21s

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