enable manual test run

Author: RichardZhu2

.github/workflows/test.yml

@@ -7,6 +7,9 @@ on:
     paths:
       - "src/pyper/**"
       - "tests/**"
+  
+  workflow_dispatch:
+
 
 jobs:
   test:
@@ -30,7 +33,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "${{ matrix.python-version }}"
+          python-version: ${{ matrix.python-version }}
 
       - name: Install dependencies
         run: |