Update dependency execa to v9

Author: renovate[bot]

package.json

@@ -84,7 +84,7 @@
   "dependencies": {
     "@antfu/ni": "0.21.8",
     "@pnpm/audit": "7.0.19",
-    "execa": "5.1.1",
+    "execa": "9.4.0",
     "pkg-dir": "5.0.0"
   },
   "resolutions": {