deps: bump @actions/exec from 1.0.4 to 1.1.0 (#618)

Bumps [@actions/exec](https://github.com/actions/toolkit/tree/HEAD/packages/exec) from 1.0.4 to 1.1.0.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/exec/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/@actions/core@1.1.0/packages/exec)

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

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package.json

@@ -48,7 +48,7 @@
   "homepage": "https://github.com/peaceiris/actions-gh-pages#readme",
   "dependencies": {
     "@actions/core": "^1.5.0",
-    "@actions/exec": "^1.0.4",
+    "@actions/exec": "^1.1.0",
     "@actions/github": "^5.0.0",
     "@actions/glob": "^0.2.0",
     "@actions/io": "^1.1.0",