fix yaml syntax to fix CI (#212)

Author: kumaraditya303

.github/workflows/main.yml

@@ -40,7 +40,7 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
     - name: Set up Python ${{ matrix.python }} using deadsnakes
-    - uses: deadsnakes/[email protected]
+      uses: deadsnakes/[email protected]
       if: "endsWith(matrix.python, '-dev')"
       with:
         python-version: ${{ matrix.python }}