Fix publishing artifacts from the main branch (#6290)

Previously an `event` filter was applied to lookup the merge queue's
github run ID but this filter doesn't work after #6288. The filter isn't
strictly necessary, though, so remove it.

.github/workflows/publish-artifacts.yml

@@ -18,7 +18,7 @@ jobs:
         sha=${{ github.sha }}
         run_id=$(
           gh api -H 'Accept: application/vnd.github+json' \
-              /repos/${{ github.repository }}/actions/workflows/main.yml/runs\?event=push\&exclude_pull_requests=true \
+              /repos/${{ github.repository }}/actions/workflows/main.yml/runs\?exclude_pull_requests=true \
               | jq '.workflow_runs' \
               | jq "map(select(.head_commit.id == \"$sha\"))[0].id" \
         )