Upgrade local dev to use electric beta.15 (#1699) #2046

Job	Run time
typecheck / typecheck	3m 27s
units / 🧪 Unit Tests	2m 22s
publish-webapp / publish	2m 43s
publish-worker / build (coordinator)	1m 30s
publish-worker / build (docker-provider)	53s
publish-worker / build (kubernetes-provider)	41s
	11m 36s

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