Update release note.

Author: akshay-joshi

docs/en_US/release_notes_9_3.rst

@@ -30,4 +30,5 @@ Housekeeping
 Bug fixes
 *********
 
-  | `Issue #8443 <https://github.com/pgadmin-org/pgadmin4/issues/8443>`_ -  Fixed an issue where the debugger hangs when stepping into nested function/procedure.
+  | `Issue #8443 <https://github.com/pgadmin-org/pgadmin4/issues/8443>`_ -  Fixed an issue where the debugger hangs when stepping into nested function/procedure.
+  | `Issue #8556 <https://github.com/pgadmin-org/pgadmin4/issues/8556>`_ -  Ensure that graph data is updated even when the Dashboard tab is inactive.