devel/rust-bindgen: update to 0.69.4

0.69.4 (2024-02-04)
Changed
- Allow older itertools. (#2745)

0.69.3 (2024-02-04)
Added
- Added blocklist_var (#2731)
- Stabilized thiscall_abi (#2661)

Changed
- Use CR consistently on windows (#2698)
- Replaced peeking_take_while by itertools (#2724)

Removed
Fixed
- Try to avoid repr(packed) for explicitly aligned types when not needed (#2734)
- Improved destructor handling on Windows (#2663)
- Support Float16 (#2667)
- Fix alignment contribution from bitfields (#2680)
- Fixed msrv build.

Security
- Updated shlex dependency (RUSTSEC-2024-0006)

0.69.2 (2024-01-13)
Fixed
- Fixed generation of extern "C" blocks with llvm 18+. See #2689.

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