Update Rust crate thiserror to v2

Author: renovate[bot]

Cargo.lock

@@ -19,7 +19,7 @@ xcsoar = ["encoding_rs"]
 encoding_rs = { version = "0.8.34", optional = true }
 minidom = { version = "0.12.0", optional = true }
 quick-xml = { version = "0.30.0", optional = true }
-thiserror = "1.0.59"
+thiserror = "2.0.0"
 
 [dev-dependencies]
 anyhow = "1.0.82"