Wouter Deconinck 0298823e28 edm4hep: allow variant cxxstd 20, sync with podio (#32698) ... Now that `podio` can support `cxxstd` variants 17 and 20, we can allow `edm4hep` to use `cxxstd=20` as well, but must ensure that `edm4hep` uses the same `cxxstd` variant as `podio`. Solution as in `celeritas`.		2022-09-19 10:51:22 -07:00
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spack	edm4hep: allow variant cxxstd 20, sync with podio (#32698)	2022-09-19 10:51:22 -07:00