Update ag-grid monorepo to v31 #346

Job	Run time
trade-processor-dockerfile-scan	1m 42s
database-dockerfile-scan	1m 29s
account-service-dockerfile-scan	1m 42s
trade-feed-dockerfile-scan	1m 41s
position-service-dockerfile-scan	1m 51s
people-service-dotnet-scan	38s
account-service-gradle-scan	1m 11s
trade-service-dockerfile-scan	1m 43s
database-gradle-scan	48s
web-front-end/angular-dockerfile-scan	2m 45s
reference-data-node-scan	52s
position-service-gradle-scan	1m 18s
people-service-dockerfile-scan	1m 30s
trade-feed-node-scan	30s
trade-processor-gradle-scan	1m 12s
reference-data-dockerfile-scan	3m 27s
web-front-end/angular-node-scan	1m 4s
trade-service-gradle-scan	1m 29s
web-front-end/proxy-node-scan	29s
web-front-end/react-node-scan	1m 40s
	29m 1s

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