ci: update studion/core to v3.0.0 (#49)

The core orb is regularly updated as a dependency.
However, that does not affect orbs "test-deploy" config.
This change address this neglected part.

Author: droguljic

.circleci/test-deploy.yml

@@ -1,7 +1,7 @@
 version: 2.1
 orbs:
   orb-tools: circleci/orb-tools@12.0
-  core: studion/core@1.0.0
+  core: studion/core@3.0.0
   docker: circleci/docker@2.8.2
   security: {}