Update dependencies on '6.3' in qt/qtlanguageserver

Change-Id: Ife2375bc2fe8efd9975b0cb48890f0265b09a7f8
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: d9f46d969f1a895e1b7f416562dbab702bdfead9
+    ref: 7d8e9325df62b9ccc4adec11455c3d678f9afd8a
     required: true