fix: use static qualifier for constant

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Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/rayleigh/skewness/src/main.c

@@ -19,7 +19,7 @@
 #include "stdlib/stats/base/dists/rayleigh/skewness.h"
 #include "stdlib/math/base/assert/is_nan.h"
 
-const double SKEWNESS_CONSTANT = 0.6311106578189365;
+static const double SKEWNESS_CONSTANT = 0.6311106578189365;
 
 /**
 * Returns the skewness of a Rayleigh distribution.