fix: Export `RemoveDeadFuncsError` #3336

Job	Run time
Check for changes	4s
tests (Rust nightly, coverage)	3m 14s
Build benchmarks 🏋️	3m 1s
tests (Rust 1.75)	2m 52s
check	3m 15s
tests (Rust stable, no features)	2m 12s
tests (Rust beta)	3m 46s
tests (Rust stable, all features)	3m 13s
Check standard extensions	4s
Required checks 🦀	1s
	21m 42s

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