adapt the code to hdf5 2.0

[jkotan]

To adapt the code to hdf5 2.0 we need to add LibVersion for 2.0 and update the tests. Currently, they are failing with

 │ │ 65: $SRC_DIR/test/property/file_access_test.cpp:93
 │ │ 65: ...............................................................................
 │ │ 65: 
 │ │ 65: $SRC_DIR/test/property/file_access_test.cpp:95: FAILED:
 │ │ 65:   REQUIRE( fapl.library_version_bound_low() == pl::LibVersion::Earliest )
 │ │ 65: with expansion:
 │ │ 65:   V18 == EARLIEST

https://github.com/conda-forge/h5cpp-feedstock/actions/runs/23473139826/job/68300248695?pr=2#step:3:2619