libobs: Update version to 31.1.0

libobs/obs-config.h

@@ -34,14 +34,14 @@
  *
  * Reset to zero each major version
  */
-#define LIBOBS_API_MINOR_VER 0
+#define LIBOBS_API_MINOR_VER 1
 
 /*
  * Increment if backward-compatible bug fix
  *
  * Reset to zero each major or minor version
  */
-#define LIBOBS_API_PATCH_VER 3
+#define LIBOBS_API_PATCH_VER 0
 
 #define MAKE_SEMANTIC_VERSION(major, minor, patch) ((major << 24) | (minor << 16) | patch)