[Packaging] Bump embedded Python to 3.9 for deb packages #22171
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Description
#22035 dropped tests for Python 3.9. However, Mariner's built-in Python is 3.9.
To make sure Azure CLI works perfectly with Python 3.9, we will have to bring back tests for Python 3.9. Then we will have
Such inconsistency introduces maintenance difficulty. Testing for all these Python versions also adds lots of burden to the CI pipeline.
If DEB's Python is bumped to Python 3.9, Python 3.8's test can be replaced by Python 3.9 tests. Or, we can take one step even further - to use the latest Python 3.10 directly (#22170) for better security and performance.
Mariner should also use Python 3.10 (microsoft/azurelinux#2860).