fix(jssp): run clippy... (#438)

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## Description

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## Linked issues

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## Important implementation details

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examples/jssp/problem/probe.rs

@@ -52,7 +52,7 @@ impl JsspProbe {
             }
         }
 
-        return (n_unique as f64) / (population.len() as f64);
+        (n_unique as f64) / (population.len() as f64)
     }
 
     // #[inline]