[chore] Remove invalid fields from update-otel GH actions

I took them from another OTel project, but apparently the values are invalid. A multiline YAML flag is missing. I'm removing them for now since I don't think they are necessary

.github/workflows/update-otel.yaml

@@ -31,12 +31,6 @@ jobs:
           branch: opentelemetrybot/update-otel
           path: opentelemetry-collector-contrib
           base: main
-          author:
-            opentelemetrybot
-            <[email protected]>
-          committer:
-            opentelemetrybot
-            <[email protected]>
           token: ${{ secrets.OPENTELEMETRYBOT_GITHUB_TOKEN }}
           commit-message: [chore] Update to latest opentelemetry-collector release.
           title: "[chore] Update to latest opentelemetry-collector"