TEMP: Restore matrix.python

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -39,8 +39,7 @@ jobs:
       - name: Install python packages
         uses: ./.github/actions/install_requirements
         with:
-          # python_version: ${{ matrix.python }}
-          python_version: "3.12"
+          python_version: ${{ matrix.python }}
           requirements_file: requirements-test-${{ matrix.os }}-${{ matrix.python }}.txt
           install_options: ${{ matrix.install }}