chore: fix C lint errors

PR-URL: #7843
Closes: #7842
Reviewed-by: Athan Reines <[email protected]>

Author: GeoDaoyu

lib/node_modules/@stdlib/stats/base/snanvariancepn/src/snanvariancepn.c

@@ -38,8 +38,8 @@
 */
 static void snansumpw( const int64_t N, double *W, const float *X, const int64_t stride ) {
 	int64_t ix;
-	float *xp1;
-	float *xp2;
+	const float *xp1;
+	const float *xp2;
 	float sum;
 	int64_t M;
 	int64_t n;