Disable sourcery check

Sourcery changed its license model to only be available for open source
projects with the free plan. According to the documentation, sourcery
should detect automatically whether it is running on an open source
repo. This does not work in our case, though. Disable it until we find a
way to correctly make it work.

.gitlab-ci.yml

@@ -70,12 +70,16 @@ script_limit:
         --key before_script
         --key after_script
 
-sourcery:
-  extends: .analyze
-  script:
-    - cd scripts
-    - sourcery login --token $SOURCERY_TOKEN
-    - sourcery review --check --verbose *.py
+# FIXME: Find out how to correctly use sourcery with its new open source plan. According
+# to the documentation, the login step should be obsolete. Sourcery complains, however,
+# that our code is closed-source, which is not true.
+# See https://docs.sourcery.ai/Guides/Getting-Started/Command-Line/
+# sourcery:
+#   extends: .analyze
+#   script:
+#     - cd scripts
+#     - sourcery login --token $SOURCERY_TOKEN
+#     - sourcery review --check --verbose *.py
 
 yamllint:
   extends: .analyze