Bump actions/checkout from 3 to 6 #42757

Job	Run time
unit (20)	5m 36s
unit (24)	4m 26s
vscode_unit (20)	6m 11s
vscode_unit (22)	7m 33s
unit (22)	5m 41s
agent_evals_build (22)	2m 14s
check-package-lock (20)	30s
check-package-lock-vsce (20)	16s
vscode_unit (24)	10m 35s
lint	0s
check-json-schema (20)	2m 6s
integration-windows (20, npm run test:hosting)	47s
integration-windows (20, npm run test:client-integration)	1m 24s
integration-windows (20, npm run test:functions-discover)	44s
integration-windows (20, npm run test:storage-deploy)	48s
integration-windows (20, npm run test:triggers-end-to-end:inspect)	35s
integration-windows (20, npm run test:emulator)	39s
integration-windows (20, npm run test:frameworks)	1m 32s
integration (20, npm run test:hosting)	2m 52s
integration (20, npm run test:frameworks)	5m 19s
integration (20, npm run test:functions-discover)	4m 38s
integration (20, npm run test:emulator)	3m 52s
integration (20, npm run test:storage-deploy)	3m 16s
integration (20, npm run test:triggers-end-to-end)	3m 4s
integration (20, npm run test:extensions-emulator)	2m 38s
integration (20, npm run test:import-export)	5m 12s
integration (20, npm run test:dataconnect-emulator)	3m 38s
integration (20, npm run test:storage-emulator-integration)	6h 0m 15s
integration (20, npm run test:triggers-end-to-end:inspect)	3m 3s
integration (20, npm run test:client-integration)	3m 0s
	7h 32m 24s

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