Bump thiserror from 2.0.0 to 2.0.3

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 2.0.0 to 2.0.3.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@2.0.0...2.0.3)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -24,7 +24,7 @@ scale-bits = "0.7.0"
 scale-info = { version = "2.11.1", features = ["derive", "bit-vec", "decode", "docs", "serde"] }
 smallvec = "1.10.0"
 syn = { version = "2.0.38", features = ["full", "extra-traits"] }
-thiserror = { version = "2.0.0", default-features = false }
+thiserror = { version = "2.0.3", default-features = false }
 prettyplease = "0.2.25"
 scale-decode = "0.16.0"
 scale-encode = "0.10.0"