feat: celeritas: require +root

Avoid errors like:

jug_dev> wdconinc@menelaos:~/git/epic$ celer-export-geant epic.gdml '' output.json
info: Using default Celeritas Geant4 options
status: Initializing Geant4 run manager
status: Initializing Geant4 geometry
info: Loading Geant4 geometry from GDML at epic.gdml
status: Building Geant4 physics tables
status: Transferring data from Geant4
status: Loading external elemental data
info: Opening JSON output at output.json
/tmp/root/spack-stage/spack-stage-celeritas-0.5.0-luyvi73exkq3jx55muwzls2cmatui6dc/spack-src/app/celer-export-geant.cc:193: critical: Runtime error: celeritas: configuration error: required dependency is disabled in this build: ROOT

assigned to @wdconinc

enabled an automatic merge when all merge checks for 610e6380 pass

aborted the automatic merge because target branch was updated

added 3 commits

• 610e6380...89cd813d - 2 commits from branch master
• c095b82a - feat: celeritas: require +root

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added 1 commit

• d7f6e77c - fix: celeritas: require: one_of: [~cuda +root, +cuda ~root]

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added 3 commits

• 6a7b5017 - 1 commit from branch master
• 3b29a84b - feat: celeritas: require +root
• 39d37b61 - fix: celeritas: require: one_of: [~cuda +root, +cuda ~root]

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enabled an automatic merge when all merge checks for 39d37b61 pass

aborted the automatic merge because the source branch was updated. Learn more.

added 1 commit

• 86660000 - fix: celeritas: +cuda ~ipo +root

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added 1 commit

• 8f9b32ce - fix: celeritas: +cuda +ipo ~root

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added 5 commits

• 7f0bf68f - 1 commit from branch master
• 238a948b - feat: celeritas: require +root
• 4cd2d5fd - fix: celeritas: require: one_of: [~cuda +root, +cuda ~root]
• de34e89d - fix: celeritas: +cuda ~ipo +root
• 223567f2 - fix: celeritas: +cuda +ipo ~root

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merged