bump internal version

src/namespace-hooks.ts

@@ -6,7 +6,7 @@ export default {
 	// When introducing internal API incompatibilities (where fullcalendar plugins would break),
 	// the minor version of the calendar should be upped (ex: 2.7.2 -> 2.8.0)
 	// and the below integer should be incremented.
-	internalApiVersion: 11,
+	internalApiVersion: 12,
 
 	// for GlobalEmitter
 	touchMouseIgnoreWait: 500,