Enable `update` workflow

[stephenmathieson]

Got an email from GitHub saying this repo's update workflow has been disabled. It should be dusted off/cleaned up and turned back on.

[Richienb]

According to the Actions screen, the script successfully ran an hour ago "Triggered via schedule":
https://github.com/stephenmathieson/node-tlds/actions/runs/20097958595

[Richienb]

@stephenmathieson It looks like the workflow was automatically disabled after Jan 10 because "there hasn't been activity in this repository for at least 60 days". You will need to re-enable the workflow from the Action page.

For a more permanent solution, I recommend that we include force-enabling the workflow as part of the job. https://stackoverflow.com/q/67184368/8384910