ci: publish to openvsx

[34j]

Description of change

Pull-Request Checklist

• [ ] Code is up-to-date with the main branch
• [ ] npm run lint passes with this change
• [ ] npm run test passes with this change
• [ ] This pull request links relevant issues as Fixes #0000
• [ ] There are new or updated unit tests validating the change
• [ ] Documentation has been updated to reflect this change
• [ ] The new commits follow conventions outlined in the conventional commit spec

[34j]

Closes #9 .

[github-actions[bot]]

:tada: This PR is included in version 1.0.3 :tada:

The release is available on:

• Visual Studio Marketplace
• GitHub release

Your semantic-release bot :package::rocket: