The stable/liberty branch no longer exists, so we need to
remove it from the releasenotes
Depends-On: Ia4e01f00c4c5e9a2087df1e2a91d9154480a0422
Depends-On: I3bbe3bafa7ea3e627272103ac16a38f6a32a8a06
Change-Id: Ibafc01b24148d072dde636ad0cf6ee1d37c5609c
Closes-Bug: 1650033