chore: release v5.1.2

[github-actions]

Prepare v5.1.2.

This PR updates Cargo metadata, the changelog, the generated man page, and Arch package metadata.

Summary by Sourcery

Release instantmenu version 5.1.2 with input handling and startup performance fixes, ARM releases, and updated distribution metadata.

New Features:

• Add ARM release support.

Bug Fixes:

• Fix startup input loss when keys are held.
• Further reduce font-loading latency.

Build:

• Update Cargo and Arch package metadata for version 5.1.2.

Documentation:

• Update the changelog and generated man page for v5.1.2.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Prepares the v5.1.2 release by synchronizing the Rust package version, generated man page, changelog, and Arch packaging metadata, including the release notes for ARM support.

File-Level Changes

Change	Details	Files
Bump the project release version across Rust metadata and generated documentation.	Update the package version to 5.1.2 and synchronize the lockfile. Regenerate the man page with the 5.1.2 version in its header and version section.	Cargo.toml Cargo.lock instantmenu.1
Record the v5.1.2 release and its included changes.	Add the dated v5.1.2 changelog section with the ARM releases and merge entries.	CHANGELOG.md
Update Arch Linux package metadata for the new release.	Bump package versions for source and binary packages. Regenerate the corresponding .SRCINFO metadata.	packaging/arch/PKGBUILD packaging/arch/.SRCINFO packaging/arch-bin/PKGBUILD packaging/arch-bin/.SRCINFO

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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