PSA: new rustup version might break your CI soon. Prepare!

Rustup 1.28.0 was released today (https://blog.rust-lang.org/2025/03/02/Rustup-1.28.0.html). It includes a breaking change where the Rust toolchain from rust-toolchain.toml files won't be installed by default anymore.

If you run your CI on GitHub Actions, and use rust-toolchain.toml, you might want to take a look at updating your CI workflows, for example with the workaround mentioned in the blog post (rustup show active-toolchain || rustup toolchain install). Otherwise your CI will break when GitHub actions runner image will update to rustup 1.28.0 (which might happen in the upcoming few weeks, I assume).