Update file .gitlab-ci.yml

Tested the linting with the following Python versions:

• 3.11.9 -> working
• 3.12.0 -> working
• 3.12.1 -> working
• 3.12.1 -> working
• 3.12.2 -> working
• 3.12.3 -> working
• 3.12.4 -> not working

might be related to this https://github.com/python/cpython/issues/120343?

I guess fixing to 3.12.3 for now will fix the problem temporarily