doc: fixed 09_notebook

8 jobs for tutorial_fixes in 31 minutes and 29 seconds (queued for 1 second)
Name Stage Failure
ubuntu Test
118.87s call     lbmpy_tests/phasefield/test_numerical_1D_nphase_model.ipynb::lbmpy_tests/phasefield/test_numerical_1D_nphase_model.ipynb
116.38s call lbmpy_tests/phasefield/test_entropic_model.ipynb::lbmpy_tests/phasefield/test_entropic_model.ipynb
111.95s call lbmpy_tests/centeredcumulant/[False-D3Q19]
====== 13 failed, 526 passed, 12 skipped, 1333 warnings in 742.53 seconds ======
Uploading artifacts for failed job
Uploading artifacts...
report.xml: found 1 matching files and directories

Uploading artifacts as "junit" to coordinator... ok
id=654396 responseStatus=201 Created token=pNVqD8zg
Cleaning up file based variables
ERROR: Job failed: exit code 1