Rollup merge of #124978 - saethlin:ref-casting_derefs, r=Urgau,Nilstrieb

Handle Deref expressions in invalid_reference_casting

Similar to rust-lang/rust#124908

See rust-lang/rust#124951 for context; this PR fixes the last of the known false postiive cases with this lint that we encounter in Crater.

Author: matthiaskrgr