Update thiserror requirement from 1.0.29 to 2.0.0 (#142)

Updates the requirements on [thiserror](https://github.com/dtolnay/thiserror) to permit the latest version.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@1.0.29...2.0.0)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

openssh-sftp-error/Cargo.toml

@@ -20,7 +20,7 @@ features = ["openssh"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-thiserror = "1.0.29"
+thiserror = "2.0.0"
 awaitable-error = "0.1.0"
 openssh-sftp-protocol-error = "0.1.0"
 ssh_format_error = "0.1.0"