Use size_of from the prelude instead of imported

[thaliaarchi]

Use std::mem::{size_of, size_of_val, align_of, align_of_val} from the prelude instead of importing or qualifying them.

These functions were added to all preludes in Rust 1.80.

changelog: none

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[Centri3]

Each individual case here is fine but you should be careful removing qualified paths like this. Qualified paths in suggestions are usually intentional and necessary to remove ambiguity (especially in regards to MSRV).