ci: install build package explicitly for deploy step

Author: cainky

.github/workflows/ci.yml

@@ -135,7 +135,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -e ".[dev]"
+          pip install -e ".[dev]" build
 
       - name: Build package
         run: |