chore(deps): update dependency execa to v9 (openapi-ts#2278)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -73,7 +73,7 @@
     "degit": "^2.8.4",
     "del-cli": "^6.0.0",
     "esbuild": "^0.25.0",
-    "execa": "^8.0.1",
+    "execa": "^9.0.0",
     "strip-ansi": "^7.1.0",
     "typescript": "^5.8.3",
     "vite-node": "^2.1.9"