chore(deps): update thiserror requirement from 1.0 to 2.0 (#208)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-version: 2.0.12
  dependency-type: direct:production
...

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examples/simple-chat-client/Cargo.toml

@@ -9,7 +9,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 reqwest = { version = "0.12", features = ["json"] }
 anyhow = "1.0"
-thiserror = "1.0"
+thiserror = "2.0"
 async-trait = "0.1"
 futures = "0.3"
 toml = "0.8"