Delete rebase.yml

.github/workflows/rebase.yml

- on:
-  check_run:
-    types:
-      # Check runs completing successfully can unblock the
-      # corresponding pull requests and make them mergeable.
-      - completed
-  pull_request:
-    types:
-      # A closed pull request makes the checks on the other
-      # pull request on the same base outdated.
-      - closed
-  pull_request_review:
-    types:
-      # Review approvals can unblock the pull request and
-      # make it mergeable.
-      - submitted
-  # Success statuses can unblock the corresponding
-  # pull requests and make them mergeable.
-  status: {}
-name: Automatic Rebase
-jobs:
-  rebase:
-    name: Rebase
-    runs-on: ubuntu-latest
-    steps:
-    - name: Checkout the latest code
-      uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
-    - name: Automatic Rebase
-      uses: cirrus-actions/rebase@1.3.1
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}