Fix const-cast warning in OldSpclMcFilterTool

Fixing minor build warning seen in master--HepMC3 nightly.

assigned to @jchapman

This merge request affects 1 package:

• PhysicsAnalysis/TruthParticleID/McParticleTools

This merge request affects 1 file:

• PhysicsAnalysis/TruthParticleID/McParticleTools/src/OldSpclMcFilterTool.cxx

added Analysis master review-pending-level-1 labels

The system determined that CI tests (with names matching "^CITest_SimulationRun(2|3)AF3.*$") are not needed for this code change. They are not run. This is not an indicator to restart the job.

CI Result SUCCESS (hash fcaa042a)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
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
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 57567]

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 527ddfc2

added sweep:ignore label