Replace unsafe MaybeUninit array initialization

[chise0713]

Replace

    unsafe { MaybeUninit::uninit().assume_init() }

with

    [const { MaybeUninit::uninit() }; N]

This removes two unnecessary unsafe blocks while preserving the same behavior.

And the project's MSRV (Rust 1.87) supports this initialization pattern.

Reference: rust-lang/rust RELEASES.md#version-1790-2024-06-13 rust-lang/rust#104087

AI disclosure: ChatGPT was used to look up when const array initialization ([const { ... }; N]) became available and to confirm that it is supported by the project's MSRV. The code change was implemented, reviewed, and tested manually.

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CoreMark Benchmark Results

Current Score: 242.974
Baseline Score (main): 261.142
Difference: -18.168 (-6.96%)

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Code Coverage Report

Current Coverage: 94.78%
Baseline Coverage (main): 94.73%
Difference: +0.05%

[Kronos3]

Looks good, thanks!