actions: Remove deprecated action script command rebase

Not needed as it was integrated by GitHub

.github/workflows/rebase.yml

@@ -1,31 +0,0 @@
-name: Rebase via Comment
-run-name: Check comment for `/rebase`
-#
-# If you comment "/rebase" to the PR this Action will rebase the PR
-#
-
-on:
-  issue_comment:
-    types: [created]
-
-jobs:
-  rebase:
-    permissions:
-      contents: write # for cirrus-actions/rebase to push code to rebase
-      pull-requests: read # for cirrus-actions/rebase to get info about PR
-
-    name: Rebase
-    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0 # otherwise, you will fail to push refs to dest repo
-
-      - name: Automatic Rebase
-        uses: cirrus-actions/rebase@1.8
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}