chore(release): prepare for 1.151.2 (#6267)

following `RELEASE.md`, after merging, the following is needed:

6. Tag the release: `git tag --annotate v1.151.2`.
7. Push the release tag: `git push origin v1.151.2`.
8. Create a GitHub release: `gh release create v1.151.2 --notes ''`.

deltachat-rpc-server/npm-package/package.json

@@ -15,5 +15,5 @@
   },
   "type": "module",
   "types": "index.d.ts",
-  "version": "1.151.1"
+  "version": "1.151.2"
 }