Fix python version used for cache preparaation (apache#23785)

Cache preparation on CI used default (Python 3.7) version of the
image. It had an influence on time of "full build needed" only and
for users who wanted to build breeze image for Python version
different than default Python 3.7.

It had no big influence on "main" builds" because in main we are
build images with "upgrade-to-newer-dependencies" which takes
longer anyway.

.github/workflows/ci.yml

@@ -1683,7 +1683,7 @@ ${{ hashFiles('.pre-commit-config.yaml') }}"
           --prepare-buildx-cache
           --platform linux/amd64,linux/arm64
         env:
-          PYTHON_MAJOR_MINOR_VERSION: ${{ needs.build-info.outputs.defaultPythonVersion }}
+          PYTHON_MAJOR_MINOR_VERSION: ${{ matrix.python-version }}
       - name: >
           Pull CI image for PROD build
           ${{ env.PYTHON_MAJOR_MINOR_VERSION }}:${{ env.IMAGE_TAG_FOR_THE_BUILD }}"