Update thiserror requirement from 1.0 to 2.0

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@1.0.0...2.0.0)

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

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

Cargo.toml

@@ -11,7 +11,7 @@ clingo-dl-plugin = { git = "https://github.com/potassco/clingo-dl-theory-rs", br
 clingcon-plugin = { git = "https://github.com/potassco/clingcon-theory-rs", branch = "master" }
 rocket = { version = "0.5.0-rc.2", features = ["json"] }
 parking_lot = "0.12"
-thiserror = "1.0"
+thiserror = "2.0"
 libloading = "0.8"
 serde = "1.0"
 serde_json = "1.0"