Update runs-on parameter.

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 6
       matrix:
@@ -29,8 +29,6 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: ${{ matrix.python-version }}
-          os: ${{ matrix.os }}
-          architecture: x64
 
       - name: Install dependencies
         run: |