Bugfix: Set removal date for Backend API stability items to 22.11

 * This is to allow EthosN more time to adjust to new API.

Signed-off-by: Francis Murtagh <francis.murtagh@arm.com>
Change-Id: I7da32a7317827dfa619c74fc8801447e7172e7c8
diff --git a/src/backends/backendsCommon/MemCopyWorkload.hpp b/src/backends/backendsCommon/MemCopyWorkload.hpp
index 1c6fa70..30949df 100644
--- a/src/backends/backendsCommon/MemCopyWorkload.hpp
+++ b/src/backends/backendsCommon/MemCopyWorkload.hpp
@@ -5,4 +5,4 @@
 
 #include <armnn/backends/MemCopyWorkload.hpp>
 #pragma message("src/backends/backendsCommon/MemCopyWorkload.hpp has been deprecated, it is due for removal in"\
-                " 22.08 release. Please use public interface include/armnn/backends/MemCopyWorkload.hpp")
+                " 22.11 release. Please use public interface include/armnn/backends/MemCopyWorkload.hpp")