chore(release-please-config): remove pull-request-title-patter

Author: odest

release-please-config.json

@@ -2,7 +2,6 @@
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
   "sequential-calls": true,
   "plugins": ["cargo-workspace"],
-  "pull-request-title-pattern": "release version: v${version}",
   "include-component-in-tag": false,
   "packages": {
     ".": {