chore(release-please): release as draft

Per immutable release best practices,
https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/immutable-releases#best-practices-for-publishing-immutable-releases

Author: scop

.github/release-please-config.json

@@ -12,5 +12,6 @@
     "bash_completion",
     "configure.ac"
   ],
+  "draft": true,
   "extra-label": "bot"
 }