RootUtils: Fix refcounting in PyGetString.

Do not change the refcount of the string passed to us. But we do need to decrement the refcount of the temporary returned from PyCodec_Encode, if we use it.

This merge request affects 1 package:

• Control/RootUtils

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash e2a945fb)

	Athena	AthSimulation
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 7075]

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

merged

mentioned in commit ebb87fb2

added sweep:ignore label