fix(deps): update dependency @actions/core to v2

Author: renovate[bot]

package-lock.json

@@ -28,7 +28,7 @@
   "author": "Kengo TODA <skypencil@gmail.com>",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.10.0",
+    "@actions/core": "^2.0.0",
     "@actions/exec": "^1.1.1",
     "@actions/tool-cache": "^2.0.1",
     "@octokit/core": "^7.0.2",