ci(deps): add syncpack format to lockfile workflow

Uses syncpack format to keep package.json files properly sorted
without using fix-mismatches which was reverting Dependabot updates.

Author: Mearman

.github/workflows/dependabot-lockfile.yml

@@ -39,6 +39,9 @@ jobs:
           node-version: 20
           cache: pnpm
 
+      - name: Format package.json files with syncpack
+        run: pnpm syncpack format
+
       - name: Regenerate lockfile
         run: pnpm install --no-frozen-lockfile
 
@@ -56,6 +59,6 @@ jobs:
         run: |
           git config user.name "dependabot[bot]"
           git config user.email "49699333+dependabot[bot]@users.noreply.github.com"
-          git add pnpm-lock.yaml
-          git commit -m "chore(deps): update lockfile"
+          git add -A
+          git commit -m "chore(deps): format package.json and update lockfile"
           git push origin "$PR_HEAD_REF"