xAODTruthCnv: Const fixes.

Fix thread-safety checker warnings in HepMC3 build.

This merge request affects 1 package:

• Event/xAOD/xAODTruthCnv

This merge request affects 2 files:

• Event/xAOD/xAODTruthCnv/src/HepMCTruthReader.cxx
• Event/xAOD/xAODTruthCnv/src/xAODTruthCnvAlg.cxx

Adding @akraszna as watcher

added EDM analysis-review-required master review-pending-level-1 labels

CI Result SUCCESS (hash 0f22f59d)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional 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
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 51626]

added analysis-review-approved label and removed analysis-review-required label

Changes and CI look fine. Approving.

Kira (L1)

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

merged

mentioned in commit bd859894

added sweep:ignore label