unwinding: bump version to fix asm

With rust-lang#80608 the `unwinding` crate no longer builds. The upstream crate
has been updated to build by manually adding directives to the naked_asm
stream.

Bump the dependency in Rust to get this newer version. This fixes the
build for Xous, and closes rust-lang#134403.

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

library/Cargo.lock

@@ -403,9 +403,9 @@ dependencies = [
 
 [[package]]
 name = "unwinding"
-version = "0.2.4"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2c6cb20f236dae10c69b0b45d82ef50af8b7e45c10e429e7901d26b49b4dbf3"
+checksum = "51f06a05848f650946acef3bf525fe96612226b61f74ae23ffa4e98bfbb8ab3c"
 dependencies = [
  "compiler_builtins",
  "gimli 0.31.1",

library/unwind/Cargo.toml

@@ -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 = "0.2.3", features = ['rustc-dep-of-std', 'unwinder', 'fde-custom'], default-features = false }
+unwinding = { version = "0.2.5", features = ['rustc-dep-of-std', 'unwinder', 'fde-custom'], default-features = false }
 
 [features]