[Rust] use core:error:Error unconditionally #8565
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Since Error is now part of core, this PR enables the previously gated std features to now work on no_std targets.
The "std" feature still exists in Cargo.toml, but it doesn't do anything.
A downside of this PR is that this raises the minimum supported rust version to 1.81 for future releases. Please let me know your opinion on this PR.