Update dependencies on '6.2.1' in qt/qtscxml

Change-Id: Ib92f6afcb440f96043033e593c79a89cb996bbad
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: a5dfbb04a7404eab223151dda160597a7698c704
+    ref: 9fa805f7f8dfe96d561e9ed3170770ad768baf93
     required: true
   ../qtdeclarative:
-    ref: 16313520867124296355d4c682321fd0bdb71e49
+    ref: 973399d8e67c264a55ff0f394865a1b721bd8b5a
     required: true