run_functional_tests: use the python3.13 image for venv creation
The newer bastions have python3.13, not 3.11 so the venv created with 3.11 does not work for them.
Bug: T402377 Signed-off-by: David Caro dcaro@wikimedia.org
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The newer bastions have python3.13, not 3.11 so the venv created with 3.11 does not work for them.
Bug: T402377 Signed-off-by: David Caro dcaro@wikimedia.org