fix: enable `util` feature on `tower` #139

Job	Run time
lint	9s
typecheck (packages/client)	10s
clippy (.)	33s
typecheck (packages/svelte)	19s
clippy (examples/authentication)	25s
typecheck (examples/authentication/auth-demo)	16s
clippy (examples/chaos)	24s
typecheck (examples/chaos)	13s
clippy (examples/chat-room-react/src-rust)	36s
typecheck (examples/chat-room-react)	13s
clippy (examples/counter)	31s
typecheck (examples/counter)	16s
clippy (examples/hello-world)	32s
typecheck (examples/hello-world)	13s
	4m 50s

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