Tap homebrew/science formulae to install OMERO via Homebrew

HDF5 formula has been recently moved to homebrew-science. Thus tapping this
repository is now required to install all of OMERO dependencies.

This PR should turn the OMERO-homebrew-stable green again. A rebased PR will be opened to fix the OMERO-homebrew-develop job.
Once jobs are green, 2 documentation PRs will be opened to document this new tap requirement.