Expose `Dependencies` field in Library struct #5402

Job	Run time
run-determination	1s
check-outdated (./)	18s
check-formatting (./)	26s
check-style (./)	1m 3s
check-config (./)	15s
check-license-headers (./)	27s
build (internal/arduino/discovery/discovery_client)	19s
build (rpc/internal/client_example)	37s
build (commands/term_example)	37s
	4m 3s

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