[w3c/manifest] chore: switch to respec-autopublish (#873)

This change (choose one):

* [X] Is a "chore" (metadata, formatting, fixing warnings, etc).

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/873

-- Commit Summary --

  * chore: switch to respec-autopublish

-- File Changes --

    A .github/workflows/action.yml (20)
    D .travis.yml (29)

-- Patch Links --

https://github.com/w3c/manifest/pull/873.patch
https://github.com/w3c/manifest/pull/873.diff

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