delete old deprecations

cpp/ql/lib/semmle/code/cpp/exprs/Expr.qll

@@ -719,13 +719,6 @@ class ReferenceToExpr extends Conversion, @reference_to {
 class PointerDereferenceExpr extends UnaryOperation, @indirect {
   override string getAPrimaryQlClass() { result = "PointerDereferenceExpr" }
 
-  /**
-   * DEPRECATED: Use getOperand() instead.
-   *
-   * Gets the expression that is being dereferenced.
-   */
-  deprecated Expr getExpr() { result = this.getOperand() }
-
   override string getOperator() { result = "*" }
 
   override int getPrecedence() { result = 16 }