Bump actions/setup-node from 3 to 4 #947

Job	Run time
setup-matrix	7s
run-integration-tests (./examples/app-with-on-behalf-of-auth)	2m 35s
run-integration-tests (./examples/datasource-http)	1m 8s
run-integration-tests (./examples/panel-visx)	1m 8s
run-integration-tests (./examples/panel-frame-select)	1m 12s
run-integration-tests (./examples/datasource-http-backend)	3m 19s
run-integration-tests (./examples/app-with-extension-point)	2m 27s
run-integration-tests (./examples/app-basic)	2m 42s
run-integration-tests (./examples/panel-flot)	1m 12s
run-integration-tests (./examples/panel-scatterplot)	1m 23s
run-integration-tests (./examples/app-with-extensions)	2m 45s
run-integration-tests (./examples/app-with-backend)	3m 2s
run-integration-tests (./examples/panel-datalinks)	2m 14s
run-integration-tests (./examples/app-with-scenes)	3m 0s
run-integration-tests (./examples/datasource-basic)	3m 45s
run-integration-tests (./examples/datasource-streaming-websocket/streaming-websocket-plugin)	1m 8s
run-integration-tests (./examples/app-with-dashboards)	2m 38s
run-integration-tests (./examples/datasource-logs)	1m 18s
run-integration-tests (./examples/panel-basic)	3m 7s
run-integration-tests (./examples/datasource-streaming-backend-websocket/streaming-backend-websoc...	2m 21s
run-integration-tests (./examples/app-with-service-account)	2m 36s
run-integration-tests (./examples/panel-plotly)	2m 45s
notify	0s
	47m 52s

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