Main reason to update is the addition/enhancement of
H5Pset_libver_bounds():
"Added an enumerated value to H5F_libver_t for H5Pset_libver_bounds()." - https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.2/src/hdf5-1.10.2-RELEASE.txt

This allows to write backwards compatible files with newer hdf5 versions, although this is "opt-in" by the library users. See e.g. https://github.com/Unidata/netcdf-c/issues/250, https://github.com/Unidata/netcdf-c/issues/951

- Update to 1.10.3:
https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.3/src/hdf5-1.10.3-RELEASE.txt
- Update to 1.10.2:
https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.2/src/hdf5-1.10.2-RELEASE.txt
- Bump soversions (101 -> 103) for libhdf5 and libhdf5_cpp
- Drop Fix-warnings-for-missing-returns.patch, fixed upstream
- Add 0001-Fix-return-value-in-test_libver_bounds_open.patch
- Rebase patches (tab / space conversion):
* PPC64LE-Fix-long-double-handling.patch
* hdf5-buildcompare.patch
* hdf5-mpi.patch
- Rebase Disable-phdf5-tests.patch