fix s3i messages variable

3 jobs for master in 46 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build Wheel
passed wheel #1291905
wheel

00:00:32

 
  Build Doc
failed pages #1291907
doc

00:00:13

failed pages #1291906
doc

00:00:13

 
Name Stage Failure
failed
pages Build Doc
Downloading artifacts for wheel (1291905)...
Downloading artifacts from coordinator... ok
id=1291905 responseStatus=200 OK token=A_-y4hgu
Executing "step_script" stage of the job script
$ pip install -r ./requirements.txt
Collecting ml==0.1
ERROR: HTTP error 404 while getting https://git.rwth-aachen.de/kwh40/fml40-reference-implementation/-/jobs/artifacts/dev_chen/raw/public/ml-0.1-py3-none-any.whl?job=wheel
ERROR: Could not install requirement ml==0.1 from https://git.rwth-aachen.de/kwh40/fml40-reference-implementation/-/jobs/artifacts/dev_chen/raw/public/ml-0.1-py3-none-any.whl?job=wheel (from -r ./requirements.txt (line 1)) because of HTTP error 404 Client Error: Not Found for url: https://git.rwth-aachen.de/kwh40/fml40-reference-implementation/-/jobs/artifacts/dev_chen/raw/public/ml-0.1-py3-none-any.whl?job=wheel for URL https://git.rwth-aachen.de/kwh40/fml40-reference-implementation/-/jobs/artifacts/dev_chen/raw/public/ml-0.1-py3-none-any.whl?job=wheel
Cleaning up file based variables
ERROR: Job failed: exit code 1