Update dependencies on '6.3' in qt/qtlanguageserver

Change-Id: Ibb37c8ce1d213448e3f35f0ad9e6ba383234afbb
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: 2ba00de3d5ace56983a42ede0a651f4a3083cef7
+    ref: 574fc358e70b0d5149cb2ffb98118ced71e7d5c2
     required: true