[ci] Disable venv cache.

.gitlab-ci.yml

 variables:
   PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
   BUILDKIT_PROGRESS: "plain"
-cache:
-  paths:
-    - .cache/pip
-    - .venv/
+# cache:
+#   paths:
+#     - .cache/pip
+#     - .venv/
 
 before_script:
   - poetry install