fix: update type expectations in cumin tests to match generic return type

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---

Author: deepak427

lib/node_modules/@stdlib/stats/base/cumin/docs/types/test.ts

@@ -27,7 +27,7 @@ import cumin = require( './index' );
 	const x = new Float64Array( 10 );
 	const y = new Float64Array( 10 );
 
-	cumin( x.length, x, 1, y, 1 ); // $ExpectType NumericArray
+	cumin( x.length, x, 1, y, 1 ); // $ExpectType Float64Array
 	cumin( x.length, new AccessorArray( x ), 1, new AccessorArray( y ), 1 ); // $ExpectType AccessorArray<number>
 }
 
@@ -125,7 +125,7 @@ import cumin = require( './index' );
 	const x = new Float64Array( 10 );
 	const y = new Float64Array( 10 );
 
-	cumin.ndarray( x.length, x, 1, 0, y, 1, 0 ); // $ExpectType NumericArray
+	cumin.ndarray( x.length, x, 1, 0, y, 1, 0 ); // $ExpectType Float64Array
 	cumin.ndarray( x.length, new AccessorArray( x ), 1, 0, new AccessorArray( y ), 1, 0 ); // $ExpectType AccessorArray<number>
 }