Remove redundant overrides

ruby/ql/lib/codeql/ruby/ast/Module.qll

@@ -214,8 +214,6 @@ class Namespace extends ModuleBase, ConstantWriteAccess, TNamespace {
     result = ModuleBase.super.getAChild(pred) or
     result = ConstantWriteAccess.super.getAChild(pred)
   }
-
-  final override string toString() { result = ConstantWriteAccess.super.toString() }
 }
 
 /**

ruby/ql/lib/codeql/ruby/ast/Variable.qll

@@ -122,8 +122,6 @@ class VariableAccess extends Expr instanceof VariableAccessImpl {
     or
     synthChild(any(BlockParameter p), 0, this)
   }
-
-  final override string toString() { result = VariableAccessImpl.super.toString() }
 }
 
 /** An access to a variable where the value is updated. */

ruby/ql/lib/codeql/ruby/controlflow/internal/ControlFlowGraphImpl.qll

@@ -1380,10 +1380,6 @@ module Trees {
     final override predicate first(AstNode first) { this.firstInner(first) }
 
     final override predicate last(AstNode last, Completion c) { this.lastInner(last, c) }
-
-    final override predicate succ(AstNode pred, AstNode succ, Completion c) {
-      BodyStmtTree.super.succ(pred, succ, c)
-    }
   }
 
   private class UndefStmtTree extends StandardPreOrderTree, UndefStmt {