unwind: update unwinding dependency to 0.2.3

The recent changes to naked `asm!()` macros made this unbuildable
on Xous. The upstream package maintainer released 0.2.3 to fix support
on newer nightly toolchains.

Update the dependency to 0.2.3, which is the oldest version that works
with the current nightly compiler.

This closes #131602 and fixes the build on xous.

Signed-off-by: Sean Cross <sean@xobs.io>

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