Bump version to 1.6.0-rc2
Update manifests to v1.5.7
Update manifests to v1.6.0-rc1
Update manifests to v1.5.6
Update manifests to v1.5.5
Update manifests to v1.5.4
Update manifests to v1.5.3
Update manifests to v1.5.2
Update manifests to v1.4.3