TriggerMenu: python 3 fixes

Pickle files need to be opened as binary.

This merge request affects 1 package:

• Trigger/TriggerCommon/TriggerMenu

added Trigger TriggerMenu master review-pending-level-1 labels

CI Result SUCCESS (hash 51ec17df)

	Athena	AthSimulation	AthGeneration
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 17712]

merged

mentioned in commit dfb97df5

added sweep:ignore label