fix: make go-generate workflow pull latest remote

[rvagg]

No description provided.

[galargh]

Would you mind providing a little bit of context for the change? Why is the desired behaviour?

[rvagg]

Because it's a cron job that's meant to check for changes to the multicodec table and open a PR here with the go generate changes when there are changes to the table. It's been running regularly but never opened a PR because it just fetches the submodule commit that's checked in here. By providing --remote we're asking it to fetch the latest HEAD commit and test that. We should get a PR after this is merged and run next because there's been quite a few changes.