Bump @actions/core from 1.2.7 to 1.3.0 (#316) [skip ci]

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
   },
   "homepage": "https://github.com/lowlighter/metrics#readme",
   "dependencies": {
-    "@actions/core": "^1.2.7",
+    "@actions/core": "^1.3.0",
     "@actions/github": "^4.0.0",
     "@octokit/graphql": "^4.6.2",
     "@octokit/rest": "^18.5.3",