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AtlasHepMC: Add missing unordered_map include for gcc12

Johannes Elmsheuser requested to merge elmsheus/athena:dev4_20230202 into master

The dev4LCG nightlies have been switched to HepMC3 a few days ago. This MR fixes the compilation of AtlasHepMC and dependent packages for the gcc12 dev4LCG nightly.

Tagging @averbyts, @ewelina, @jchapman for info.

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