deps: bump @actions/exec from 1.0.3 to 1.0.4

Bumps [@actions/exec](https://github.com/actions/toolkit/tree/HEAD/packages/exec) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/master/packages/exec/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/exec)

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

package.json

@@ -52,7 +52,7 @@
   "homepage": "https://github.com/peaceiris/actions-hugo#readme",
   "dependencies": {
     "@actions/core": "^1.2.3",
-    "@actions/exec": "^1.0.3",
+    "@actions/exec": "^1.0.4",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^1.3.4",
     "node-fetch": "^2.6.0"