Bump @actions/core from 1.2.6 to 1.4.0

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.6 to 1.4.0.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

---
updated-dependencies:
- dependency-name: "@actions/core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -22,7 +22,7 @@
   "license": "MIT",
   "dependencies": {
     "@actions/artifact": "^0.5.2",
-    "@actions/core": "^1.2.6",
+    "@actions/core": "^1.4.0",
     "@actions/exec": "^1.1.0",
     "@actions/github": "^4.0.0",
     "@actions/http-client": "^1.0.11",