AthenaConfiguration: Update for python 3.9 compatibility.

collections.Sequence is deprecated as of python 3.3, and removed in 3.9.

This merge request affects 1 package:

• Control/AthenaConfiguration

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash fbd819b0)

	Athena	AthSimulation	AnalysisBase	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
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 15610]

The changes are fine and there are no CI issues. Approving.

Jason (L1)

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

mentioned in commit ecad6c4a

merged

added sweep:ignore label