disable Spock-core (agrafix/Spock#184)

Author: juhp

build-constraints.yaml

@@ -1703,7 +1703,7 @@ packages:
 
     "Alexander Thiemann <mail@athiemann.net> @agrafix":
         - Spock
-        - Spock-core
+        - Spock-core < 0 # 9.6 https://github.com/agrafix/Spock/issues/184
         - Spock-api
         - Spock-api-server
         - Spock-worker