Fix various new lints introduced on nightly #1687
Description
See for example the errors in this CI run: https://github.com/rust-osdev/uefi-rs/actions/runs/15502479250
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See for example the errors in this CI run: https://github.com/rust-osdev/uefi-rs/actions/runs/15502479250