Flakey test with SCIP solver

[RobbieKiwi]

Version Checks (indicate both or one)

• I have confirmed this bug exists on the lastest release of Linopy.

• I have confirmed this bug exists on the current master branch of Linopy.

Issue Description

Sometimes the solver time limit test fails with SCIP
test_optimization.py
test_solver_time_limit_options
(scip, mps, false)

The tests were all green on my feature branch
But then after the PR was merged, the same test failed on master

Reproducible Example

It is not easily reproducible, that is the problem. The test passes on my machine.

I guess to reproduce it you have to trigger the github test pipeline lots of times

Expected Behavior

I expect the test to always pass when the github pipeline runs

Installed Versions