fix: add Signed-off-by to autobump commit message for DCO compliance (#19)

Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>

Author: yordis

.github/workflows/autobump.yml

@@ -233,7 +233,7 @@ jobs:
         uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8.1.0
         with:
           token: ${{ secrets.GH_PAT_RELEASE_PLEASE_ACTION }}
-          commit-message: "feat: bump ${{ matrix.formula }} to ${{ steps.upstream.outputs.version }}"
+          commit-message: "feat: bump ${{ matrix.formula }} to ${{ steps.upstream.outputs.version }}\n\nSigned-off-by: TrogonStack Bot <bot@trogonstack.com>"
           branch: "bump-${{ matrix.formula }}-${{ steps.upstream.outputs.version }}"
           title: "feat: bump ${{ matrix.formula }} to ${{ steps.upstream.outputs.version }}"
           body: |