Added `npm version minor` to Ghost-CLI tests

no issue

- migrations in master aren't run in Ghost-CLI tests because the
  package.json version is less than the migration versions
- we should be able to artificially bump the package.json so they get
  run

.github/workflows/test.yml

@@ -68,6 +68,7 @@ jobs:
         with:
           node-version: '10.13.0'
       - run: npm install -g ghost-cli@latest
+      - run: npm --no-git-tag-version version minor # We need to artificially bump the minor version to get migrations to run
       - run: zip -r ghost.zip .
 
       - name: Clean Install