Fix/leaderboard bot author (#661)

* fix: use github-actions bot as commit author

* fix: set GitHub Actions bot as committer

Author: Harxhit

.github/workflows/leaderboard.yml

@@ -40,4 +40,6 @@ jobs:
           body: "Automated update of contributor leaderboard data."
           branch: "automation/leaderboard-update"
           base: "main"
-          delete-branch: true
+          delete-branch: true
+          author: "github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>"
+          committer: "github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>"