COMPMID-1135 Fix CLGEMMDilatedConvolution mismatch

Change-Id: I61364c935c157db352336d126788bfbd18191d2b
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/130748
Reviewed-by: Isabella Gottardi <isabella.gottardi@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/tests/validation/CL/DilatedConvolutionLayer.cpp b/tests/validation/CL/DilatedConvolutionLayer.cpp
index d02497d..9da7c32 100644
--- a/tests/validation/CL/DilatedConvolutionLayer.cpp
+++ b/tests/validation/CL/DilatedConvolutionLayer.cpp
@@ -201,7 +201,7 @@
                                                                                                                        framework::dataset::make("ActivationLayerInfo", ActivationLayerInfo())))
 {
     // Validate output
-    validate(CLAccessor(_target), _reference, tolerance_f32);
+    validate(CLAccessor(_target), _reference, tolerance_f32, 0.00002);
 }
 TEST_SUITE_END()
 TEST_SUITE_END()