[Clarabel.cpp] Pin Clarabel to the Crate (not the git submodule)

--- rust_wrapper/Cargo.toml
+++ rust_wrapper/Cargo.toml
@@ -5,4 +5,4 @@
 
 [dependencies]
-clarabel = { path = "../Clarabel.rs" }
+clarabel = "0.7.1"
 
