[ci] Do not install twine on deployment (only docs anyways)

5 jobs for master in 1 minute and 50 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #247469
docker
build

00:00:41

 
  Test
passed #247472
docker
test_py310

00:00:34

25.0%
passed #247470
docker
test_py38

00:00:34

25.0%
passed #247471
docker
test_py39

00:00:34

25.0%
 
  Deploy
failed #247473
docker
deploy_beta

00:00:34

 
Name Stage Failure
failed
deploy_beta Deploy
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/local/lib/python3.10/site-packages/bob/devtools/scripts/ci.py", line 14, in <module>
from ..build import comment_cleanup, load_order_file, uniq
File "/usr/local/lib/python3.10/site-packages/bob/devtools/build.py", line 20, in <module>
import conda_build.api
ModuleNotFoundError: No module named 'conda_build'

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