ci: Update Rust toolchain version to 1.88

[sagudev]

To fix CI: https://github.com/servo/mozangle/actions/runs/29141242178/job/86514745581#step:5:62

[sagudev]

I think linux problem is real and it is #88

[jschwe]

I was planning to update mozangle to latest upstream (ESR). Perhaps that wil also fix this issue.

[jschwe]

Note, the linker failure doesn't happen with rust 1.95, I'm assuming because we are using lld. So probably it's just an issue with the order of libraries on the link line.

[sagudev]

Note, the linker failure doesn't happen with rust 1.95, I'm assuming because we are using lld. So probably it's just an issue with the order of libraries on the link line.

That would make sense, but we want to support more, so we should fix this properly. Can you fix the order here?

[jschwe]

Yes, I can post a patch later, once I'm back at the computer, need to do something else first.

[sagudev]

Done via #100