rhi: Run cleanup callbacks before the pending deletes

If a callback deleteLaters a QRhiResource that should still be
handled and not left unreleased. Swap the order.

Pick-to: 6.6 6.5
Change-Id: I8419a28a9db5bb59f768ab5820dfaf593464d6d2
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

src/gui/rhi/qrhi.cpp

@@ -8069,11 +8069,11 @@ QRhi::~QRhi()
     if (!d)
         return;
 
+    runCleanup();
+
     qDeleteAll(d->pendingDeleteResources);
     d->pendingDeleteResources.clear();
 
-    runCleanup();
-
     d->destroy();
     delete d;
 }