Remove build-requirements

Author: jorgensd

.github/workflows/dolfinx-tests.yml

@@ -78,7 +78,8 @@ jobs:
         run: ctest -V --output-on-failure -R unittests
       - name: Install DOLFINx (Python)
         run: |
-          python3 -m pip install --break-system-packages -r dolfinx/python/build-requirements.txt # TO REMOVE
+          python3-m pip install scikit-build-core
+          python3 -m scikit_build_core.build requires | python3 -c "import sys, json; print(' '.join(json.load(sys.stdin)))" | xargs pip install
           python3 -m pip -v install --break-system-packages --check-build-dependencies --no-build-isolation dolfinx/python/
       - name: Run mypy checks
         run: |