Update dependency @actions/exec to v3

Author: renovate[bot]

package-lock.json

@@ -65,7 +65,7 @@
   },
   "dependencies": {
     "@actions/core": "^2.0.3",
-    "@actions/exec": "^2.0.0",
+    "@actions/exec": "^3.0.0",
     "@elgato/cli": "1.7.4"
   },
   "devDependencies": {