fix: add missing stdint.h include for UINT32_MAX in wren_core.c

The UINT32_MAX macro is defined in <stdint.h> but was not included, causing
compilation errors on platforms where it is not implicitly pulled in by other
headers. This commit adds the missing include to ensure the constant is
available for use in the source file.

src/wren_core.c

@@ -1,4 +1,5 @@
 #include <math.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>