Fix T69352: Audio strips don't update when changing frame_start

Tag depsgraph update as a part of cache invalidation.

Author: mdewanchand

Reviewed By: ISS

Differential Revision: https://developer.blender.org/D5718

source/blender/blenkernel/intern/sequencer.c

@@ -4349,6 +4349,7 @@ static void sequence_invalidate_cache(Scene *scene,
   }
 
   sequence_do_invalidate_dependent(scene, seq, &ed->seqbase);
+  DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
   BKE_sequencer_prefetch_stop(scene);
 }