Add Python 3.11 to integration tests

[thomas-bc]

Originating Project/Creator
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Has Unit Tests (y/n)
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Change Description

Adding Python 3.11 to the integration test workflow.
I also set the strategy.fail-fast to false. Default was True which caused all integration tests to abort if one failed, which can give a wrong impression of what's happening and take longer to review. That way, we know which ones are failing and which ones are not, without having to dig through the logs.
I also removed some unused variables that were probably copy/pasted from somewhere else, as it doesn't look like they were ever used.

[LeStarch]

Note, we should add F´ 3.1.1 to this list at some point too.