Bump @actions/core from 1.4.0 to 1.6.0

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.4.0 to 1.6.0.
- [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] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -19,7 +19,7 @@
   "author": "Arne Jørgensen",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.4.0",
+    "@actions/core": "^1.6.0",
     "@octokit/rest": "^18.9.0",
     "@types/semver": "^7.3.8",
     "semver": "^7.3.5"