IVGCVSW-4519 Remove Boost Variant and apply_visitor variant

  * replace boost::variant with mapbox::util::variant
  * replace boost::apply_visitor with mapbox::util::apply_visitor
  * replace boost::get with mapbox::util::get

Signed-off-by: James Ward <james.ward@arm.com>
Change-Id: I38460cabbcd5e56d4d61151bfe3dcb5681ce696e
diff --git a/tests/YoloInferenceTest.hpp b/tests/YoloInferenceTest.hpp
index 6c783d3..81ba0f5 100644
--- a/tests/YoloInferenceTest.hpp
+++ b/tests/YoloInferenceTest.hpp
@@ -38,7 +38,7 @@
 
         using Boost3dArray = boost::multi_array<float, 3>;
 
-        const std::vector<float>& output = boost::get<std::vector<float>>(this->GetOutputs()[0]);
+        const std::vector<float>& output = mapbox::util::get<std::vector<float>>(this->GetOutputs()[0]);
         ARMNN_ASSERT(output.size() == YoloOutputSize);
 
         constexpr Boost3dArray::index gridSize = 7;