Run update as part of CI

[gr2m]

follow up to #468 @timrogers

Sorry for that, the same happened in other repositories. We need to run the update script as part of the test CI here:

types.ts/.github/workflows/test.yml

Line 21 in e80d45f

- run: npm test

I just made a similar change here:
https://github.com/octokit/plugin-rest-endpoint-methods.js/pull/569/files