refactor: replace int8_t by size_t

---
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description: Results of running static analysis checks when committing changes.
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---

Author: gunjjoshi

lib/node_modules/@stdlib/math/base/special/fibonacci/src/main.c

@@ -20,6 +20,7 @@
 #include "stdlib/constants/float64/max_safe_nth_fibonacci.h"
 #include "stdlib/math/base/assert/is_nonnegative_integer.h"
 #include <stdint.h>
+#include <stdlib.h>
 
 static const int64_t fibonacci_value[ 79 ] = {
 	0,
@@ -117,5 +118,5 @@ double stdlib_base_fibonacci( const double n ) {
 	if ( !stdlib_base_is_nonnegative_integer( n ) || n > STDLIB_CONSTANT_FLOAT64_MAX_SAFE_NTH_FIBONACCI ) {
 		return 0.0 / 0.0; // NaN
 	}
-	return fibonacci_value[ (int8_t)n ];
+	return fibonacci_value[ (size_t)n ];
 }