deps: bump @actions/core from 1.5.0 to 1.6.0

Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.5.0 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] <support@github.com>

package.json

@@ -47,7 +47,7 @@
   },
   "homepage": "https://github.com/peaceiris/actions-gh-pages#readme",
   "dependencies": {
-    "@actions/core": "^1.5.0",
+    "@actions/core": "^1.6.0",
     "@actions/exec": "^1.1.0",
     "@actions/github": "^5.0.0",
     "@actions/glob": "^0.2.0",