Fix fetching of tags for deployment of a new package

.gitlab-ci.yml

@@ -37,7 +37,7 @@ deploy:
   image: $CI_REGISTRY/funkwhale/backend-test-docker:3.10
   before_script:
     - poetry install
-    - git pull --tags
+    - git fetch --tags
   script:
     - poetry version $(git describe --tags --abbrev=0)
     - poetry build