Update build_documentation.yml

.github/workflows/build_documentation.yml

@@ -8,9 +8,6 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: [3.10]
 
     steps:
       - uses: actions/checkout@v2
@@ -18,7 +15,7 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.10"
 
       - name: Install dependencies
         run: |