chore: bump MSRV to 1.81 & use core::error::Error
in place of std
#780
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Motivation
Bumping the MSRV to 1.81 lets us use
core::error::Error
as it was finally added to the core library.The only places where a
std
feature gate for errors was not removed, was becauseconst-hex
and/orruint
would need to do this too. @DaniPopes wdyt?Solution
std
feature gates for error impls, usecore::error::Error
PR Checklist