ci: publish action should run on the main branch

[amondnet]

Describe the changes proposed in this Pull Request.

@pavanpodila

After renaming the master branch to main, publish is not running.

https://github.com/mobxjs/mobx.dart/blob/d14a27ee402b6da90b36b50d82f5531baa46db43/.github/workflows/publish.yml#L6

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Pull Request Checklist

• [x] If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• [x] Increment the major/minor/patch/patch-count, depending on the complexity of change
• [x] Add the necessary unit tests to ensure the coverage does not drop
• [x] Update the Changelog to include all changes made in this PR, organized by version
• [x] Run the melos run set_version command from the root directory
• [x] Include the necessary reviewers for the PR
• [x] Update the docs if there are any API changes or additions to functionality

[netlify[bot]]

👷 Deploy request for mobx pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	1966d75900e9eae3e711df5b59f68706cb95f624

[codecov[bot]]

Codecov Report

Merging #965 (1966d75) into main (d14a27e) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

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[amondnet]

I temporarily recreated the master branch. Since the pr has been merged, I will delete the master branch.