Fix tests

[tdegeus]

In file included from /home/runner/work/GooseFEM/GooseFEM/docs/examples/statics/Periodic_LinearElastic/main.cpp:4:
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/usr/share/miniconda/envs/test/include/XDMFWrite_HighFive.hpp: In instantiation of ‘static std::__cxx11::string XDMFWrite_HighFive::detail::to<T, >::str(const T&) [with T = GooseFEM::Mesh::ElementType; = void; std::__cxx11::string = std::__cxx11::basic_string]’:
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/usr/share/miniconda/envs/test/include/XDMFWrite_HighFive.hpp:595:27: required from ‘std::vector<std::__cxx11::basic_string > XDMFWrite_HighFive::Topology(const HighFive::File&, const string&, const T&) [with T = GooseFEM::Mesh::ElementType; std::__cxx11::string = std::__cxx11::basic_string]’
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/home/runner/work/GooseFEM/GooseFEM/docs/examples/statics/Periodic_LinearElastic/main.cpp:159:58: required from here
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/usr/share/miniconda/envs/test/include/XDMFWrite_HighFive.hpp:334:34: error: no matching function for call to ‘to_string(const GooseFEM::Mesh::ElementType&)’
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return std::to_string(arg);
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~~~~~~~~~~~~~~^~~~~

[tdegeus]

GooseFEM was improperly detected by XDMFWrite_HighFive because GOOSEFEM_VERSION_MAJOR was deprecated in favour of GOOSEFEM_VERSION. This fixed now in XDMFWrite_HighFive