Update harbor-cli to v0.0.26 - #668

GitHub Actions is not permitted to create or approve pull requests. - https://docs.github.com/rest/pulls/pulls#create-a-pull-request

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, peter-evans/create-pull-request@v7. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/