fix(deps): update dependency @actions/exec to v3

Author: renovate[bot]

package-lock.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "@actions/core": "^2.0.2",
-    "@actions/exec": "^2.0.0",
+    "@actions/exec": "^3.0.0",
     "@actions/github": "^9.0.0",
     "markdownlint": "^0.40.0"
   },