Remove two unused includes in HdrHeap.h.

Author: Walter Karas

proxy/hdrs/HdrHeap.h

@@ -33,9 +33,7 @@
 #pragma once
 
 #include "tscore/Ptr.h"
-#include "tscore/ink_defs.h"
 #include "tscore/ink_assert.h"
-#include "tscore/Arena.h"
 #include "tscore/Scalar.h"
 #include "HdrToken.h"
 

proxy/http3/QPACK.h

@@ -28,6 +28,7 @@
 #include "tscpp/util/IntrusiveDList.h"
 #include "MIME.h"
 #include "QUICApplication.h"
+#include <tscore/Arena.h>
 
 class HTTPHdr;