ci(deps): fix workflow order - install dependencies before syncpack

syncpack requires node_modules to be installed to work properly.
Was running syncpack before pnpm install causing ELIFECYCLE errors.

Author: Mearman

.github/workflows/dependabot-lockfile.yml

@@ -39,12 +39,12 @@ jobs:
           node-version: 20
           cache: pnpm
 
+      - name: Install dependencies
+        run: pnpm install --no-frozen-lockfile
+
       - name: Format package.json files with syncpack
         run: pnpm syncpack format
 
-      - name: Regenerate lockfile
-        run: pnpm install --no-frozen-lockfile
-
       - name: Check for changes
         id: changes
         run: |