TrkVolumes: cmake fix

Missing find_package for boost.

This merge request affects 1 package:

• Tracking/TrkDetDescr/TrkVolumes

This merge request affects 1 file:

• Tracking/TrkDetDescr/TrkVolumes/CMakeLists.txt

added Tracking main review-pending-level-1 labels

CI Result SUCCESS (hash 0183c021)

	Athena
externals
cmake
make
tests

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added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 601b86de