fix(deps): update dependency octokit-plugin-create-pull-request to v6

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

Author: renovate[bot]

package-lock.json

@@ -13,7 +13,7 @@
   "devDependencies": {},
   "dependencies": {
     "@octoherd/cli": "^5.0.0",
-    "octokit-plugin-create-pull-request": "^5.0.0"
+    "octokit-plugin-create-pull-request": "^6.0.0"
   },
   "keywords": [
     "octoherd-script"