build: remove last rebase step (#5737)

.github/workflows/release.yml

@@ -100,13 +100,3 @@ jobs:
             --exact               \
             --yes                 \
             from-package
-
-      - name: Rebase 'next'
-        run: |
-          # Ensure branches are up to date
-          git fetch origin current:current -u
-          git fetch origin next:next -u
-
-          git checkout next
-          git rebase current
-          git push --set-upstream origin next