Updated to version 3.1.9 for development

include/SDL3/SDL.h

@@ -20,7 +20,7 @@
 */
 
 /**
- * Main include header for the SDL library, version 3.1.8
+ * Main include header for the SDL library, version 3.1.9
  *
  * It is almost always best to include just this one header instead of
  * picking out individual headers included here. There are exceptions to

include/SDL3/SDL_version.h

@@ -62,7 +62,7 @@ extern "C" {
  *
  * \since This macro is available since SDL 3.1.3.
  */
-#define SDL_MICRO_VERSION   8
+#define SDL_MICRO_VERSION   9
 
 /**
  * This macro turns the version numbers into a numeric value.