libobs: Update version to 31.0.3

(cherry picked from commit 3e84469cc19ce429b7f57f43484f94310dddf847)

libobs/obs-config.h

@@ -41,7 +41,7 @@
  *
  * Reset to zero each major or minor version
  */
-#define LIBOBS_API_PATCH_VER 2
+#define LIBOBS_API_PATCH_VER 3
 
 #define MAKE_SEMANTIC_VERSION(major, minor, patch) ((major << 24) | (minor << 16) | patch)