Create mergeback even if already released

This captures hotfixes on main

Author: henrymercer

.github/workflows/post-release-mergeback.yml

@@ -132,7 +132,7 @@ jobs:
           echo "::endgroup::"
 
       - name: Create mergeback branch and PR
-        if: ${{ steps.check.outputs.exists != 'true' && endsWith(github.ref_name, steps.getVersion.outputs.latest_release_branch) }}
+        if: ${{ endsWith(github.ref_name, steps.getVersion.outputs.latest_release_branch) }}
         uses: ./.github/actions/prepare-mergeback-branch
         with:
           base: "${{ env.BASE_BRANCH }}"