Attempt to use cibuildwheel 2.3.1 again

This approach specifies the environment variable inside the
CIBW_ENVIRONMENT variable, which will mean it won't interfere with
cibuildwheel setting up its own environment

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Install Python Dependencies
         # Pin cibuildwheel due to https://github.com/pypa/cibuildwheel/issues/962
-        run: pip install build cibuildwheel==2.2.2
+        run: pip install build cibuildwheel>=2.3.1
 
       - name: Build Sdist
         if: matrix.sdist
@@ -81,6 +81,7 @@ jobs:
       - name: Build Wheel
         run: cibuildwheel --output-dir dist
         env:
+          CIBW_ENVIRONMENT: PIP_USE_DEPRECATED=out-of-tree-build
           CIBW_BUILD: ${{ matrix.python }}*64
           CIBW_TEST_EXTRAS: dev
           CIBW_TEST_COMMAND: pytest {project}/tests --cov-report xml:${{ matrix.cov_file }} --junit-xml=${{ matrix.results_file }}