increase max-version to 12

Signed-off-by: Jan-Christoph Borchardt <hey@jancborchardt.net>

appinfo/info.xml

@@ -23,7 +23,7 @@
 	<dependencies>
 		<php min-version="5.4" max-version="7.0" />
 		<owncloud min-version="9.1" max-version="9.2" />
-		<nextcloud min-version="9.1" max-version="11" />
+		<nextcloud min-version="9.1" max-version="12" />
 	</dependencies>
 	<repair-steps>
 		<post-migration>