Update actions version and config for signed commits

.github/workflows/keep-binary-updated.yml

@@ -16,7 +16,7 @@ jobs:
   keep-binary-up-to-date:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Regenerate binary
         run: make
       - name: Did anything change?
@@ -28,11 +28,12 @@ jobs:
           echo "binaryupdated=${binaryupdated}" >> $GITHUB_OUTPUT
       - name: Create PR with changes
         if: steps.vars.outputs.binaryupdated != 0
-        uses: peter-evans/create-pull-request@v4
+        uses: peter-evans/create-pull-request@v7
         with:
           commit-message: Update binary for ${{ github.ref_name }}
           title: Update caddy binary for ${{ github.ref_name }}
           body: This is an auto-generated PR to add an updated binary on ${{ github.ref_name }}.
           labels: binary-update, automated-pr
           branch: ${{ steps.vars.outputs.branchname }}
           base: ${{ github.ref_name }}
+          sign-commits: true