specify architecture on setup

Author: Mikhail Koliada

.github/workflows/python-builder.yml

@@ -131,6 +131,7 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ env.VERSION }}
+          architecture: ${{ matrix.arch }}
 
       - name: Verbose sysconfig dump
         if: runner.os == 'Linux' || runner.os == 'macOS'