[IA-2339] Fixing locally failing test - empty geom

[tdethier]

Fixes the empty geom unit test both locally and on the CI.

Related JIRA tickets : IA-2339

Self proofreading checklist

• Did I use eslint and black formatters
• Is my code clear enough and well documented
• Are my typescript files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Doc

Long thread on Slack explaining what I tried to do in order to solve this: https://bluesquare.slack.com/archives/C032F8GFAUD/p1721726253767399

Changes

• Upgraded the CI Ubuntu version
• Fixed the unit code test

How to test

• Launch tests locally
• Check the CI in this PR

Print screen / video

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Notes

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[tdethier]

I'll do some cleanup before any merge (right after taking care of OUCRCs).
Also, if we upgrade the Ubuntu version, it should be done for all 3 jobs, not just the test_python one