try fixing windows 2.7 build

Author: kmike

.github/workflows/tests.yml

@@ -33,7 +33,7 @@ jobs:
           python -m pip install --upgrade cython
 
       - name: "Install Visual C++ for Python 2.7"
-        if: ${{ (runner.os == 'Windows') && (runner.python-version == '2.7') }}
+        if: ${{ (runner.os == 'Windows') && (matrix.python-version == '2.7') }}
         run: |
           choco install vcpython27 -f -y