[CI] Use `poetry version -s` instead of cutting long output

3 jobs for ci/use-poetry-version-short in 54 seconds (queued for 8 seconds)
latest
Status Name Job ID Coverage
  Build
passed build_metapackages #67811

00:00:18

 
  Publish
passed deploy_gitlab #67812

00:00:14

 
  Integration
failed check_apps #67813
allowed to fail

00:00:21

 
Name Stage Failure
failed
check_apps Integration
 [testenv:build]
commands_pre =
- poetry run sh -c "cd aleksis; aleksis-admin compilemessages"
commands = poetry build

[testenv:docs]

Cleaning up file based variables
ERROR: Job failed: exit code 1