Update Settings and Signals version (#3398)

Co-authored-by: zneix <zneix@zneix.eu>

src/widgets/splits/SplitContainer.hpp

@@ -29,7 +29,7 @@ class Notebook;
 // inside but it doesn't expose any of it publicly.
 //
 
-class SplitContainer final : public BaseWidget, pajlada::Signals::SignalHolder
+class SplitContainer final : public BaseWidget
 {
     Q_OBJECT
 
@@ -260,6 +260,8 @@ private:
     std::unordered_map<Split *, pajlada::Signals::SignalHolder>
         connectionsPerSplit_;
 
+    pajlada::Signals::SignalHolder signalHolder_;
+
     bool isDragging_ = false;
 };