Default python version is used when building image (#13285)

For image build the python version is passed via
PYTHON_MAJOR_MINOR_VERSION but there is a part of the build
(preparing airflow package) that uses python installed on host.

This is fine for Master/2.0 to use same version as the image
but it should be unified (and in 1.10 when trying to build 2.7
image it would fail).

(cherry picked from commit c2bedd580c)

.github/workflows/build-images-workflow-run.yml

@@ -317,7 +317,7 @@ jobs:
       - name: "Setup python"
         uses: actions/setup-python@v2
         with:
-          python-version: ${{  matrix.python-version }}
+          python-version: ${{ needs.build-info.outputs.defaultPythonVersion }}
         if: steps.defaults.outputs.proceed == 'true'
       - name: >
           Override "scripts/ci" with the "${{ needs.cancel-workflow-runs.outputs.targetBranch }}" branch