Update dependencies on '6.1.2' in qt/qtshadertools

Change-Id: I33957f3881778addb0c5a5657cfe2e1c70862b96
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: a225719ae8a5920ad00e20ffe35807fdce059953
+    ref: 4dcedb8ca4ae0c9c533997074098297abbfcf1c3
     required: true