doc4allmods: add celery.apps.rst to ignore

contrib/release/doc4allmods

@@ -7,6 +7,7 @@ SKIP_FILES="celery.bin.rst celery.contrib.rst
             celery.task.schedules.rst
             celery.models.rst
             celery.concurrency.rst
+            celery.apps.rst
             celery.db.rst
             celery.db.a805d4bd.rst
             celery.db.dfd042c7.rst"