chore:replace setup-zig action since it was archived.

[GrapeBaBa]

Replace setup-zig action to mlugg/setup-zig since korandoru/setup-zig was archived.

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[Copilot]

Pull Request Overview

This PR replaces the archived korandoru/setup-zig GitHub Action with the maintained mlugg/setup-zig action across CI workflows.

Key changes:

• Updated action reference from korandoru/setup-zig@v1 to mlugg/setup-zig@v2.0.5
• Changed parameter name from zig-version to version to match new action's API
• Updated Zig versions (0.14.0 → 0.14.0, 0.14.1 → 0.14.1) to maintain consistency

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/risc0.yml	Updates setup-zig action and parameter naming
.github/workflows/ci.yml	Updates setup-zig action across multiple jobs with parameter naming changes

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[gballet]

I'm getting a lot of cache misses and inability to download the compiler :(

[gballet]

I'm not enclined to merge this at this time, since the previous one is still working with zig 0.14.0. I'm going to sit on this one for a couple of days.

[GrapeBaBa]

I'm getting a lot of cache misses and inability to download the compiler :(

That is what I met when using previous one and make this PR.

[gballet]

Yeah but that's not why both of these fails. That looked like an issue on the compiler hosting side. It seems to be fixed now though.