toolchain: bump rust toolchain version

1. allow unexpected cfgs in lib.rs, in this case
   "no_global_oom_handling" is cause warnings [1]

2. for large code models the compiler (rust linkers) now put code and
   data in `.ltext`, `.ldata`, `.lbss`, `.lrodata` instead of the
   same `.text` , `.data` ... etc. We are adjusting accordingly in the
   linker script.

3. unsafe assertions identified undefined behaviours, in this case a repr(C)
   struct was not mared as repr(packed), therefore having an unexpected
   size. The unsafe assertions was not enabled by default in debug
   builds so the idt setup code with from_raw_parts_mut() has been
   working on UB. Glad we can catch this....

related: [1] https://github.com/rust-lang/rust/pull/123501
related: [2] https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#asserting-unsafe-preconditions

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