ci: replace unmaintained goto-bus-stop/setup-zig with mlugg/setup-zig action

[Copilot]

This PR replaces the unmaintained goto-bus-stop/setup-zig GitHub Action with the actively maintained mlugg/setup-zig action in the CI workflow.

Background

The goto-bus-stop/setup-zig action is no longer maintained and the community has moved to using mlugg/setup-zig as the recommended replacement for setting up the Zig compiler in GitHub Actions workflows.

Changes Made

• Updated .github/workflows/CI.yaml line 168 to use mlugg/setup-zig@v2 instead of goto-bus-stop/setup-zig@v2
• Maintained the same Zig version (0.14.1) and conditional execution logic
• Preserved all existing functionality for musl target builds

Impact

This change affects the CI builds for the following cross-compilation targets that require Zig for linking with musl libc:

• x86_64-unknown-linux-musl
• aarch64-unknown-linux-musl

The API between the two actions is compatible, using the same version parameter, so no functional changes are expected. This ensures continued reliability of the CI pipeline while using a maintained action.

Testing

• Verified YAML syntax validity
• Confirmed the action replacement maintains identical configuration
• Validated that only musl targets are affected by this change

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