Switch system-tests to python 3.12

[cbeauchesne]

What does this PR do?
Switch system-tests to python 3.12

Motivation:
System-tests won't support python 3.9 by end of month.

Additional Notes:

How to test the change?

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[ivoanjo]

I'm assuming this is one of those "if CI is green it's working fine?" or is there any kind of extra validation we can/should do?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.91%. Comparing base (6e1050a) to head (2063564).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3764   +/-   ##
=======================================
  Coverage   97.91%   97.91%           
=======================================
  Files        1241     1241           
  Lines       74714    74714           
  Branches     3605     3605           
=======================================
+ Hits        73157    73158    +1     
+ Misses       1557     1556    -1     

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[cbeauchesne]

I'm assuming this is one of those "if CI is green it's working fine?" or is there any kind of extra validation we can/should do?

it's definitly that kind of PR 😄

[ivoanjo]

LGTM 👍