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Update uefi dep, fix building on nightly

See merge request !2

The UEFI crate has been updated to use try_trait_v2, which changes how
Status is used.
Signed-off-by: Tim Crawford <tcrawford@system76.com>

Changed `*mut ...` to `Option<NonNull<...>>`

See merge request !1

Instead of a raw pointer use a combination of Option and NonNull which
is exactly the same size as a raw pointer, expect you cannot access a
nullpointer by accident.
The assembly is completly identical on the hot path (the one that does not
procude a panic). Only one move more on the cold path (because of the
unwrap message (?).