.gitlab-ci.yml: Disable Python 2 tests

7 jobs for master in 1274 minutes and 46 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #4031
amd64
job_clang_amd64

06:02:11

passed #4029
amd64
job_clang_amd64_nosh

09:43:57

failed #4032
amd64
job_gcc_amd64

05:28:37

passed #4028
amd64
job_gcc_amd64_nosh

09:37:39

failed #4027
amd64
job_clang_amd64

09:43:20

failed #4030
amd64
job_gcc_amd64

05:32:55

failed #4026
amd64
job_gcc_amd64

08:32:22

 
Name Stage Failure
failed
job_gcc_amd64 Test
   3 tests in scalar_assortativity
53 tests in 6 items.
53 passed and 0 failed.
Test passed.

Document: demos/inference/inference
-----------------------------------
bash: line 94: 32231 Segmentation fault (core dumped) python3 /usr/bin/sphinx-build -b doctest . build *.rst demos/inference/inference.rst
ERROR: Job failed: exit status 1