Bump fastapi from 0.104.1 to 0.109.1 in /backend (#18) #19

Job	Run time
test-build-node-js-app / build (20.x)	42s
test-build-python-package / build	55s
sync-to-deployment-fork / sync-deployment-fork	4s
sync-to-hugging-face-hub-spaces / sync-to-hub	5s
	1m 46s

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