remove Deref
implementations for old "gil refs" types
#4593
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Follow-up on #4589 (comment)
I'm open to whether this needs a CHANGELOG entry... I guess it does because it can affect type bounds (e.g. as it does in this PR). Maybe that's a good reason to park this until 0.24 as a low-ish priority (breaking) change, that's easier the longer ago GIL Refs died.