fix: Fix new clippy warnings (#79)

* Fix new clippy warnings

* Allow clippy::suspicious-operation-groupings

src/linalg/mod.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::wrong_self_convention)]
 //! # Linear Algebra and Matrix Decomposition
 //!
 //! Most machine learning algorithms in SmartCore depend on linear algebra and matrix decomposition methods from this module.
@@ -265,7 +266,7 @@ pub trait BaseVector<T: RealNumber>: Clone + Debug {
             sum += xi * xi;
         }
         mu /= div;
-        sum / div - mu * mu
+        sum / div - mu.powi(2)
     }
     /// Computes the standard deviation.
     fn std(&self) -> T {

src/linalg/stats.rs

@@ -61,7 +61,7 @@ pub trait MatrixStats<T: RealNumber>: BaseMatrix<T> {
                 sum += a * a;
             }
             mu /= div;
-            *x_i = sum / div - mu * mu;
+            *x_i = sum / div - mu.powi(2);
         }
 
         x