he following error happened during the "Pushing the release branch and the tag" step:

 GitError: Pushing to github.com:WordPress/gutenberg.git
error: failed to push some refs to 'github.com:WordPress/gutenberg.git'
hint: Updates were rejected because the tag already exists in the remote.

    at GitExecutorChain.onFatalException (/Users/gziolo/Projects/gutenberg/node_modules/simple-git/src/lib/runners/git-executor-chain.js:65:87)
    at GitExecutorChain.<anonymous> (/Users/gziolo/Projects/gutenberg/node_modules/simple-git/src/lib/runners/git-executor-chain.js:56:28)
    at Generator.throw (<anonymous>)
    at rejected (/Users/gziolo/Projects/gutenberg/node_modules/simple-git/src/lib/runners/git-executor-chain.js:6:65)
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  task: {
    commands: [ 'push', 'origin', '--tags', '--verbose', '--porcelain' ],
    format: 'utf-8',
    parser: [Function: parsePushResult]
  }
} 

Aborting! Make sure to push changes applied to WordPress release branch "wp/next" manually.