Update dependencies on '6.0' in qt/qtshadertools

Change-Id: I60eec0f0114a8100c46bad18f641d60813ae882b
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: b29941f6dbf03440aeedbacf7045badc7f497f87
+    ref: 72c609203b48a684afe51878bd7bd487fe96a103
     required: true