chore(release): publish [skip ci]

- @ohif/extension-cornerstone@2.2.0
 - @ohif/extension-vtk@1.2.0
 - @ohif/core@2.3.0
 - @ohif/viewer@3.3.0

extensions/cornerstone/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/extension-cornerstone",
-  "version": "2.1.1",
+  "version": "2.2.0",
   "description": "OHIF extension for Cornerstone",
   "author": "OHIF",
   "license": "MIT",