[#80633966] Release ruby-hiera-eyaml-gpg (0.4-5-gb10d8a8)

Using the fork at:
https://github.com/alphagov/hiera-eyaml-gpg/tree/avoid_gpghome_env_var

This includes a change to set the GPG home directory without using the
GPGHOME environment variable.
It would be good to point at the commit rather than the branch.  Just to ensure that this remains consistent if more commits get added to the branch.