refactor: use `FdtNode::child` in `Fdt::find_node` (#13) #153

Job	Run time
Cargo check	24s
Code formatting checks	15s
Machete dependencies checks	1m 9s
Clippy lint checks	20s
Build with each feature combination	22s
Minimal dependency versions build	22s
Build & test (nightly, ubuntu-latest)	16s
Build & test (stable, windows-latest)	54s
Build & test (nightly, macos-latest)	34s
Build & test (1.88, ubuntu-latest)	17s
Build & test (1.88, macos-latest)	24s
Build & test (1.88, windows-latest)	48s
Build & test (stable, ubuntu-latest)	21s
Build & test (nightly, windows-latest)	40s
Build & test (stable, macos-latest)	37s
Miri test	46s
	8m 29s

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