- Fixed a bug in Pkcs11::new by replacing MaybeUninit::uninit() with null-assigned variables; this resolves an issue that prevented my PKCS#11 library from loading

- Ran `cargo update` to refresh crate versions
- Raised `rust-version` to 1.77 in `Cargo.toml`, since `mem::offset_of` is stabilized only in this version
- Made `basic.rs` tests compile successfully again

Signed-off-by: mematthias <107192630+mematthias@users.noreply.github.com>

Author: mematthias