Fix update branch names

[tlively]

PR #118 accidentally removed the time variable that was being used in update branch names. As a result, the update branch was always called "update-". Restore the variable to get different branch names for different updates.

[sbc100]

Hmm, the way the github folks have dependabot working is that there always at most one outstanding PR. So the branch name is fixed. If the bot happen to run when there is an existing PR, it updates the contents or replaces it somehow, rather than allowing multiple outstanding PRs. Not sure if we want to follow that method or not.

[tlively]

That would be fine, too. I noticed this issue because I tried to manually trigger an import before a previous automatic import was landed and the manual workflow got some errors about being unable to merge into the shared update branch: https://github.com/WebAssembly/testsuite/actions/runs/19122884507/job/54646786839.

[sbc100]

That would be fine, too. I noticed this issue because I tried to manually trigger an import before a previous automatic import was landed and the manual workflow got some errors about being unable to merge into the shared update branch: https://github.com/WebAssembly/testsuite/actions/runs/19122884507/job/54646786839.

Presumably that still happens if you try to do more than one update in a given day?

[tlively]

Yes. Fixing the script to avoid the error would be better for sure.