build(deps): bump @actions/core from 1.2.3 to 1.2.4

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/master/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -2,7 +2,7 @@
   "name": "action-download-artifact",
   "main": "main.js",
   "dependencies": {
-    "@actions/core": "^1.2.3",
+    "@actions/core": "^1.2.4",
     "@actions/github": "^2.1.1",
     "adm-zip": "^0.4.14",
     "filesize": "^6.1.0"