deps: bump @actions/exec from 1.1.0 to 1.1.1 (#720)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -48,7 +48,7 @@
   "homepage": "https://github.com/peaceiris/actions-gh-pages#readme",
   "dependencies": {
     "@actions/core": "^1.6.0",
-    "@actions/exec": "^1.1.0",
+    "@actions/exec": "^1.1.1",
     "@actions/github": "^5.0.1",
     "@actions/glob": "^0.2.0",
     "@actions/io": "^1.1.2",