Pin setuptools verison on macos CI (workaround petsc4py issue) (#4077)

* Update Python

* Remove build isolation

* Revert version

* Drop Python version

* Earlier python

* Change

* Change python

* pip version

* No build isolation

* Undo key change

* Install pyamg

* More dependency problems

Author: garth-wells

.github/workflows/macos.yml

@@ -37,7 +37,7 @@ jobs:
         uses: actions/setup-python@v6
         id: cp3
         with:
-          python-version: "3.12"
+          python-version: "3.14"
 
       - name: Install Homebrew dependencies
         run: |
@@ -46,7 +46,7 @@ jobs:
 
       - name: Install Python dependencies (petsc4py)
         run: |
-          pip install cython setuptools wheel
+          pip install cython setuptools==80 wheel
           pip install mpi4py numpy
 
       - name: Restore cache PETSc and petsc4py
@@ -121,6 +121,7 @@ jobs:
       - name: Build and install DOLFINx Python interface
         working-directory: python
         run: |
+          pip install pyamg pybind11>=2.8.0 setuptools_scm[toml]==8.3.0
           pip install scikit-build-core
           python -m scikit_build_core.build requires | python -c "import sys, json; print(' '.join(json.load(sys.stdin)))" | xargs pip install
           pip install --check-build-dependencies --no-build-isolation --config-settings=cmake.build-type="Developer" './[test]'