add FdtMut::reborrow() #394

Job	Run time
Cargo check	7s
Machete dependencies checks	6s
Code formatting checks	18s
Clippy lint checks	18s
Build & test (1.88, ubuntu-latest)	20s
Build & test (stable, ubuntu-latest)	24s
Build & test (stable, macos-latest)	16s
Build & test (nightly, macos-latest)	25s
Build & test (1.88, macos-latest)	22s
Build & test (nightly, ubuntu-latest)	17s
Build & test (nightly, windows-latest)	1m 28s
Build with each feature combination	40s
Build & test (stable, windows-latest)	1m 0s
Build & test (1.88, windows-latest)	44s
Minimal dependency versions build	20s
Miri test	1m 38s
	8m 43s

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