unwind: bump unwinding dependency to 0.2.6

With a recent change to the compiler, all instances of `#[naked]` must
now be wrapped in `#[unsafe(naked)]`. The `unwinding` crate, which is
used on Xous for doing unwinding in constrained environments, needed to
be updated to handle this change.

Bump the `unwinding` dependency to 0.2.6, which performs this wrapping.

Signed-off-by: Sean Cross <[email protected]>

Author: xobs

Cargo.lock

@@ -22,7 +22,7 @@ cfg-if = "1.0"
 libc = { version = "0.2.140", features = ['rustc-dep-of-std'], default-features = false }
 
 [target.'cfg(target_os = "xous")'.dependencies]
-unwinding = { version = "0.2.5", features = ['rustc-dep-of-std', 'unwinder', 'fde-custom'], default-features = false }
+unwinding = { version = "0.2.6", features = ['rustc-dep-of-std', 'unwinder', 'fde-custom'], default-features = false }
 
 [features]