fix(deps): update rust crate qemu-exit to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
qemu-exit	dependencies	major	3.0.2 → 4.0.0
qemu-exit	dependencies	major	3.0.0 → 4.0.0

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Release Notes

rust-embedded/qemu-exit (qemu-exit)

v4.0.0

Compare Source

Added

• Added a changelog.
• Added support for 32-bit ARM architectures (#​33).

Changed

• Moved the repository to rust-embedded under the libs team.
• Changed X86::new and RISCV64::new to unsafe.

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