Update dependency @actions/core to v1.2.7

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
     "lint": "eslint src/main.js"
   },
   "dependencies": {
-    "@actions/core": "1.2.6",
+    "@actions/core": "1.2.7",
     "@actions/github": "3.0.0"
   },
   "devDependencies": {