Update dependencies for thiserror and soroban-sdk; adjust workspace configuration

Author: 0xGeorgii

Cargo.toml

@@ -6,10 +6,11 @@ edition = "2021"
 [dependencies]
 syn = { version = "2.0.87", features = ["full"] }
 proc-macro2 = { version = "1.0.89", features = ["span-locations"] }
-thiserror = "1.0.68"
+thiserror = "2.0.3"
 macro_lib = { path = "macro_lib" }
 
 [dev-dependencies]
-soroban-sdk = "21.7.6"
+soroban-sdk = "21.7.7"
 
-workspace = { members = [".", "./macro_lib"] }
+[workspace]
+members = [".", "./macro_lib"]