fix: Export `RemoveDeadFuncsError` #3335

Job	Run time
Check for changes	6s
check	1m 51s
Build benchmarks 🏋️	3m 55s
tests (Rust nightly, coverage)	3m 38s
tests (Rust 1.75)	2m 46s
tests (Rust beta)	2m 35s
tests (Rust stable, all features)	2m 21s
tests (Rust stable, no features)	2m 13s
Check standard extensions	8s
Required checks 🦀	1s
	19m 34s

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