[Tests] Use non-deprecated TraitsData for C++ test

Update the `TraitsData` usage to reference the new location/namespace.

Signed-off-by: David Feltell <[email protected]>

Author: feltech

RELEASE_NOTES.md

@@ -4,6 +4,11 @@ Release Notes
 v1.0.0-alpha.x
 --------------
 
+### Breaking Changes
+
+* Update to use non-deprecated `TraitsData` path/namespace.
+  [#13](https://github.com/OpenAssetIO/OpenAssetIO-Test-CMake/pull/13)
+
 ### New Features
 
 * OpenAssetIO-MediaCreation integrated as a dependency, with tests.

src/test.core.cpp

@@ -1,9 +1,9 @@
 // SPDX-License-Identifier: Apache-2.0
 // Copyright 2022 The Foundry Visionmongers Ltd
 
-#include <openassetio/TraitsData.hpp>
+#include <openassetio/trait/TraitsData.hpp>
 
 int main() {
-  auto traits = openassetio::TraitsData::make();
+  auto traits = openassetio::trait::TraitsData::make();
   traits->setTraitProperty("a", "b", openassetio::Str{"c"});
 }