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/test/DataTypeUtils.hpp b/src/backends/backendsCommon/test/DataTypeUtils.hpp
index 03ee1d2..101f286 100644
--- a/src/backends/backendsCommon/test/DataTypeUtils.hpp
+++ b/src/backends/backendsCommon/test/DataTypeUtils.hpp
@@ -5,5 +5,5 @@
 
 #include "../../armnnTestUtils/DataTypeUtils.hpp"
 
-#pragma message("backendsCommon/test/DataTypeUtils.hpp has been deprecated, it is due for removal in 22.08 release." \
+#pragma message("backendsCommon/test/DataTypeUtils.hpp has been deprecated, it is due for removal in 22.11 release." \
                 " Please use from armnnTestUtils library, /src/armnnTestUtils/DataTypeUtils.hpp)