feat: update git feature for pacman master API changes

Regenerated ffi_git.rs bindings from current pacman git master and
added support for new sandbox options. The pacman-git API has split
the old disable_sandbox option into separate filesystem and syscalls
controls.

Changes:
- Regenerated ffi_git.rs from current pacman git master source
- Added sandbox_filesystem_disabled() and sandbox_syscalls_disabled()
  getters for git feature
- Added set_disable_sandbox_filesystem() and set_disable_sandbox_syscalls()
  setters for git feature
- Updated alpm-utils to handle both old (stable) and new (git) sandbox APIs
- Kept stable set_disable_sandbox() for non-git feature
- Updated sandbox test to handle cases where set_sandbox_user may fail

The git feature now properly tracks the current pacman master API with:
- alpm_option_get/set_disable_sandbox_filesystem
- alpm_option_get/set_disable_sandbox_syscalls
- alpm_sandbox_setup_child with 4 parameters (including restrict_syscalls)

Signed-off-by: Josephine Pfeiffer <[email protected]>

Author: pfeifferj