release branches uses wrong commit for tags

[sagudev]

https://github.com/servo/mozjs/releases/tag/mozjs-sys-v140.17.0-0-lts where actual commit is 011b8fb

[jschwe]

Could you explain the issue? I'm not quite following.
Edit: Oh, now I see it. I guess we are missing some flag when creating the release to specify the branch. I've noticed that too when creating servo releases, but there i always edit the release manually anyway before releasing.