Only automerge when PR author (not actor) is seambot

Author: razor-x

.github/workflows/automerge.yml

@@ -11,7 +11,7 @@ jobs:
     name: Merge
     runs-on: ubuntu-latest
     timeout-minutes: 30
-    if: (github.actor == 'dependabot[bot]') || (github.actor == 'seambot')
+    if: (github.actor == 'dependabot[bot]') || (github.event.pull_request.user.login == 'seambot')
     steps:
       - name: Approve pull request
         if: github.actor == 'dependabot[bot]'