Suppress "this-escape" warning in auto-generated entities (#388) (#408)

Co-authored-by: Dominik Skorupowski <dominik.skorupowski@syncron.com>
(cherry picked from commit f4018e7)

querydsl-codegen/src/main/java/com/querydsl/codegen/DefaultEntitySerializer.java

@@ -407,7 +407,7 @@ protected void introFactoryMethods(CodeWriter writer, final EntityType model) th
     for (Constructor c : model.getConstructors()) {
       // begin
       if (!localName.equals(genericName)) {
-        writer.suppressWarnings(UNCHECKED);
+        writer.suppressWarnings(UNCHECKED, "this-escape");
       }
       Type returnType = new ClassType(ConstructorExpression.class, model);
       final boolean asExpr = sizes.add(c.getParameters().size());