Update includes

src/mesh/MeshFlatNodeBoundary.cpp

 #include <mesh/MeshFlatNodeBoundary.hpp>
 
+#include <mesh/Connectivity.hpp>
+#include <mesh/Mesh.hpp>
+#include <utils/Messenger.hpp>
+
 template <size_t Dimension>
 void
 MeshFlatNodeBoundary<Dimension>::_checkBoundaryIsFlat(const TinyVector<Dimension, double>& normal,

src/mesh/MeshLineNodeBoundary.cpp

 #include <mesh/MeshLineNodeBoundary.hpp>
 
+#include <mesh/Connectivity.hpp>
+#include <mesh/Mesh.hpp>
+#include <utils/Messenger.hpp>
+
 template <size_t Dimension>
 void
 MeshLineNodeBoundary<Dimension>::_checkBoundaryIsLine(const TinyVector<Dimension, double>& direction,

src/mesh/MeshNodeBoundary.cpp

 #include <mesh/MeshNodeBoundary.hpp>
 
+#include <Kokkos_Vector.hpp>
+#include <mesh/Connectivity.hpp>
+#include <mesh/Mesh.hpp>
+#include <utils/Messenger.hpp>
+
 template <>
 std::array<TinyVector<2>, 2>
 MeshNodeBoundary<2>::_getBounds(const Mesh<Connectivity<2>>& mesh) const

src/mesh/MeshNodeBoundary.hpp

 #ifndef MESH_NODE_BOUNDARY_HPP
 #define MESH_NODE_BOUNDARY_HPP
 
-#include <Kokkos_Vector.hpp>
 #include <algebra/TinyVector.hpp>
-#include <mesh/Connectivity.hpp>
 #include <mesh/IBoundaryDescriptor.hpp>
 #include <mesh/ItemValue.hpp>
-#include <mesh/Mesh.hpp>
 #include <mesh/RefItemList.hpp>
 #include <utils/Array.hpp>
-#include <utils/Exceptions.hpp>
-#include <utils/Messenger.hpp>
+
+template <size_t Dimension>
+class Connectivity;
+
+template <typename ConnectivityType>
+class Mesh;
 
 template <size_t Dimension>
 class MeshNodeBoundary   // clazy:exclude=copyable-polymorphic