TrkVolumes: Update for thread-safety checker const changes.

The thread-safety checker is getting more strict on const checks. Fix resulting warnings.

This merge request affects 1 package:

• Tracking/TrkDetDescr/TrkVolumes

This merge request affects 3 files:

• Tracking/TrkDetDescr/TrkVolumes/TrkVolumes/Volume.h
• Tracking/TrkDetDescr/TrkVolumes/src/CombinedVolumeBounds.cxx
• Tracking/TrkDetDescr/TrkVolumes/src/SubtractedVolumeBounds.cxx

Adding @amorley as watcher

added Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash 3aa9bc9b)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 42691]

Approving -- L1

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

mentioned in commit f1f36264

merged

added sweep:ignore label