Fixes OpenStruct use in epics_resolvers_spec
What does this MR do and why?
Fixes OpenStruct use in ee/spec/graphql/resolvers/board_groupings/epics_resolvers_spec.rb
as Ruby 3 discourages it.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #344279
Edited by Peter Leitzen