Update dependencies on '6.4' in qt/qtlanguageserver

Change-Id: Idc6bc8d5bf0a21e70f020210e0893757dba8d129
Reviewed-by: Qt Submodule Update Bot <qt_submodule_update_bot@qt-project.org>

dependencies.yaml

 dependencies:
   ../qtbase:
-    ref: a7044900b2fa2da2bdbc9de721b62c2703d64c2a
+    ref: 379198828c446f7f0871f34a07b416d824964f95
     required: true