InDetSimEvent: Thread-safety cleanup.

Mark the ContextSpecificPtr as thread-safe, rather than marking the containing method as not thread-safe.

This merge request affects 1 package:

• InnerDetector/InDetSimEvent

Adding @goetz ,@sroe as watchers

added InnerDetector Simulation master review-pending-level-1 labels

CI Result FAILURE (hash 5a2bcbd2)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 20340]

Failing tests are showing up in several MR and are unrelated, approving.

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

merged

mentioned in commit e599a4dd

added sweep:ignore label