MuonGeoModelTestR4: cmake fix

Missing find_package for ROOT.

This merge request affects 1 package:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonGeoModelTestR4

This merge request affects 1 file:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonGeoModelTestR4/CMakeLists.txt

Adding @apsallid ,@stavrop ,@jojungge ,@pscholer ,@rosati ,@kluit as watchers

added MuonSpectrometer Upgrade main review-pending-level-1 labels

CI Result FAILURE (hash 86b87cc5)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9380] (remote access info)

Jenkins please retry a build

This merge request affects 1 package:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonGeoModelTestR4

This merge request affects 1 file:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonGeoModelTestR4/CMakeLists.txt

Adding @kluit ,@jojungge ,@rosati ,@apsallid ,@stavrop ,@pscholer as watchers

CI Result SUCCESS (hash 86b87cc5)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9387] (remote access info)

added review-approved label

removed review-pending-level-1 label

merged

mentioned in commit 911741e8