syntax: remove cache clears from tests

1 job for cache-update in 32 seconds (queued for 29 seconds)
Status Job ID Name Coverage
  Test
failed #18451
test
test

00:00:32

 
Name Stage Failure
failed
test Test

ERRORS:
djangoldp_energiepartagee.Regionalnetwork.logo: (fields.E210) Cannot use ImageField because Pillow is not installed.
HINT: Get Pillow at https://pypi.org/project/Pillow/ or run command "pip install Pillow".
djangoldp_energiepartagee.Regionalnetwork.signature: (fields.E210) Cannot use ImageField because Pillow is not installed.
HINT: Get Pillow at https://pypi.org/project/Pillow/ or run command "pip install Pillow".

System check identified 2 issues (0 silenced).
ERROR: Job failed: command terminated with exit code 1