Kernel: Declare type aliases with "using" instead of "typedef"

This is the idiomatic way to declare type aliases in modern C++.
Flagged by Sonar Cloud as a "Code Smell", but I happen to agree
with this particular one. :^)

Kernel/TTY/VirtualConsole.h

@@ -130,7 +130,7 @@ private:
 
     Cell& cell_at(size_t column, size_t row);
 
-    typedef Vector<unsigned, 4> ParamVector;
+    using ParamVector = Vector<unsigned, 4>;
 
     void on_code_point(u32);