Update dependencies on '6.3.0' in qt/qtlanguageserver

Change-Id: Id112dd94b945e7830e9ee3e894e3e9813c52705e
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: 9203a19083784856c44f2a6249364f6a81ae1667
+    ref: 9554d315aa74eaba1726405ee09117e2ebc6111f
     required: true