chore: update openapi

[vitormattos]

I identified that the openapi documentation was outdated.

todo

• check why the GitHub Action that validate the API documentation didn't broke.

[vitormattos]

/backport to stable31

[vitormattos]

/backport to stable30

[vitormattos]

/backport to stable29

[backportbot-libresign]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/4694/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 038ab867 7bb38818

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/4694/stable29

Error: Failed to push branch backport/4694/stable29: To https://github.com/LibreSign/libresign.git
! [remote rejected] backport/4694/stable29 -> backport/4694/stable29 (refusing to allow a GitHub App to create or update workflow .github/workflows/openapi.yml without workflows permission)
error: failed to push some refs to 'https://github.com/LibreSign/libresign.git'

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.