Bump @actions/core from 1.2.0 to 1.2.4

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.2.0 to 1.2.4.
- [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)

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

package.json

@@ -22,7 +22,7 @@
   },
   "homepage": "https://github.com/codecov/codecov-action#readme",
   "dependencies": {
-    "@actions/core": "^1.2.0",
+    "@actions/core": "^1.2.4",
     "@actions/exec": "^1.0.4",
     "@types/jest": "^26.0.10",
     "@zeit/ncc": "^0.22.3",