chore(build_package.yml): add newline at the end of the file for consistency with other files in the repository

Author: darinkishore

.github/workflows/build_package.yml

@@ -36,4 +36,5 @@ jobs:
       - name: Test import
         shell: bash
         working-directory: ${{ vars.RUNNER_TEMP }}
-        run: python -c "import dspy"
+        run: python -c "import dspy"
+